diff --git a/app_new/core/preventive_duration_proposals.py b/app_new/core/preventive_duration_proposals.py
new file mode 100644
index 0000000..0d7ec44
--- /dev/null
+++ b/app_new/core/preventive_duration_proposals.py
@@ -0,0 +1,27 @@
+"""Valeurs initiales de durée unitaire issues de la proposition métier.
+
+Ces valeurs sont des suggestions modifiables, jamais des durées
+réglementaires. Elles ne sont utilisées que lors de la création d'une
+nouvelle ligne de catalogue dont la durée est encore vide.
+"""
+
+PROPOSED_UNIT_DURATIONS = {
+    114: 2, 119: 2, 120: 2, 125: 5, 126: 5, 127: 10, 128: 5,
+    231: 5, 236: 10, 239: 2, 240: 5, 254: 5, 255: 5, 251: 5,
+    252: 10, 253: 10, 243: 10, 242: 2, 258: 5, 259: 5, 261: 5,
+    245: 5, 246: 5, 247: 5, 1: 2, 3: 5, 2: 2, 5: 2, 7: 10,
+    9: 2, 6: 2, 17: 10, 18: 2, 24: 2, 25: 5, 26: 5, 19: 2,
+    20: 5, 31: 10, 32: 5, 75: 2, 76: 2, 78: 5, 79: 10, 82: 5,
+    86: 5, 87: 10, 91: 5, 92: 10, 93: 10, 95: 10, 96: 10,
+    98: 10, 99: 5, 109: 5, 112: 5, 158: 5, 154: 10, 160: 5,
+    182: 5, 186: 10, 190: 5, 193: 5, 197: 5, 198: 5, 199: 5,
+    181: 2, 180: 5, 203: 10, 205: 10, 209: 2, 210: 5, 211: 10,
+    214: 5, 216: 5, 218: 2, 219: 5, 226: 5, 227: 5, 228: 5,
+    215: 2, 224: 5, 263: 5, 264: 10, 268: 10, 269: 5, 271: 2,
+    272: 2, 282: 2, 283: 10, 285: 5, 291: 10, 289: 5, 295: 5,
+    296: 5, 299: 5, 300: 5, 319: 10, 320: 5, 328: 10, 35: 2,
+    36: 5, 39: 10, 38: 5, 37: 10, 138: 2, 139: 2, 329: 10,
+    41: 2, 42: 10, 43: 5, 44: 5, 45: 5, 46: 5, 49: 2, 50: 5,
+    51: 5, 54: 5, 53: 2, 60: 5, 61: 5, 62: 5, 63: 10, 56: 10,
+    57: 10, 11: 2, 12: 5, 13: 5, 14: 2, 15: 5, 70: 2, 71: 5,
+}
diff --git a/app_new/core/routes/setup_wizard.py b/app_new/core/routes/setup_wizard.py
index 73e5130..c364d0a 100644
--- a/app_new/core/routes/setup_wizard.py
+++ b/app_new/core/routes/setup_wizard.py
@@ -472,6 +472,7 @@ def api_save_step(step):
             # ligne déjà présente n'est jamais écrasée : elle peut avoir été
             # adaptée par l'établissement depuis le dernier import.
             task_count = 0
+            from ..preventive_duration_proposals import PROPOSED_UNIT_DURATIONS
             for item in LOT_TASKS:
                 lot = lots_by_name.get(item['lot'].casefold())
                 if lot is None:
@@ -493,6 +494,14 @@ def api_save_step(step):
                 ):
                     if field in item:
                         setattr(task, field, item[field])
+                # Les propositions sont uniquement des valeurs initiales pour
+                # une nouvelle ligne. Une ligne existante/personnalisée n'est
+                # jamais écrasée par une réexécution du wizard.
+                if not task.duree_minutes and task.num_tache:
+                    try:
+                        task.duree_minutes = PROPOSED_UNIT_DURATIONS.get(int(task.num_tache))
+                    except (TypeError, ValueError):
+                        task.duree_minutes = None
                 db.session.add(task)
                 task_count += 1
 
diff --git a/app_new/core/services/maintenance_engine.py b/app_new/core/services/maintenance_engine.py
index b96f1d7..51901b6 100644
--- a/app_new/core/services/maintenance_engine.py
+++ b/app_new/core/services/maintenance_engine.py
@@ -127,7 +127,7 @@ def generate_due_tasks(task: LotTask, event=None, today=None, equipment_ids=None
         existing = ScheduledTask.query.filter(
             ScheduledTask.lot_task_id == task.id,
             ScheduledTask.equipment_id == equipment.id,
-            ScheduledTask.status.in_(['planned', 'in_progress', 'suspended']),
+            ScheduledTask.status.in_(['planned', 'in_progress', 'suspended', 'needs_duration']),
         ).first()
         if existing:
             continue
diff --git a/app_new/templates/lots/detail.html b/app_new/templates/lots/detail.html
index fe130d3..5b75a55 100644
--- a/app_new/templates/lots/detail.html
+++ b/app_new/templates/lots/detail.html
@@ -121,7 +121,7 @@
                     </div>
                 </div>
                 {% if lot.tasks %}<div class="table-responsive"><table class="table table-sm align-middle mb-0"><thead><tr><th>N°</th><th>Tâche</th><th>Exécutant</th><th>Périodicité / durée</th><th>Périmètre</th><th></th></tr></thead><tbody>
-                    {% for task in lot.tasks %}<tr class="{{ 'table-secondary' if not task.is_active }}"><td>{{ task.num_tache or '—' }}</td><td><strong>{{ task.tache or 'Tâche sans nom' }}</strong><div class="small text-muted">{{ task.trigger_type|replace('calendar','calendrier')|replace('season','saison')|replace('event','événement')|replace('weather','météo')|replace('meter','compteur')|title }}{% if task.is_safety_critical %} · sécurité{% endif %}</div></td><td><span class="badge text-bg-light">{{ {'internal':'Interne','external_company':'Entreprise extérieure','department':'Département','mixed':'Mixte','undefined':'À définir'}.get(task.executor_type, 'À définir') }}</span>{% if task.company %}<div class="small">{{ task.company.name }}</div>{% endif %}</td><td>{{ task.periodicite or (task.jours_entre_interventions|string + ' jours' if task.jours_entre_interventions else 'Périodicité à définir') }}<div class="small {% if not task.duration_is_configured %}text-warning{% else %}text-muted{% endif %}">{% if task.duration_is_configured %}{{ task.duree_minutes }} min / élément{% else %}Durée à renseigner{% endif %}</div></td><td>{{ 'Sélection manuelle (%d)'|format(task.equipment_scope|length) if task.scope_mode == 'manual' else 'Dynamique : équipements du lot' }}</td><td><a class="btn btn-sm btn-outline-primary" href="{{ url_for('lots.task_edit', lot_id=lot.id, task_id=task.id) }}" aria-label="Modifier {{ task.tache }}"><i class="bi bi-pencil"></i></a></td></tr>{% endfor %}
+                    {% for task in lot.tasks %}<tr class="{{ 'table-secondary' if not task.is_active }}"><td>{{ task.num_tache or '—' }}</td><td><strong>{{ task.tache or 'Tâche sans nom' }}</strong><div class="small text-muted">{{ task.trigger_type|replace('calendar','calendrier')|replace('season','saison')|replace('event','événement')|replace('weather','météo')|replace('meter','compteur')|title }}{% if task.is_safety_critical %} · sécurité{% endif %}</div></td><td><span class="badge text-bg-light">{{ {'internal':'Interne','external_company':'Entreprise extérieure','department':'Département','mixed':'Mixte','undefined':'À définir'}.get(task.executor_type, 'À définir') }}</span>{% if task.company %}<div class="small">{{ task.company.name }}</div>{% endif %}</td><td>{{ task.periodicite or (task.jours_entre_interventions|string + ' jours' if task.jours_entre_interventions else 'Périodicité à définir') }}<div class="small {% if not task.duration_is_configured %}text-warning{% else %}text-muted{% endif %}">{% if task.duration_is_configured %}{{ task.duree_minutes }} min / élément{% else %}<a class="text-warning" href="{{ url_for('lots.task_edit', lot_id=lot.id, task_id=task.id) }}">Durée à renseigner</a>{% endif %}</div></td><td>{{ 'Sélection manuelle (%d)'|format(task.equipment_scope|length) if task.scope_mode == 'manual' else 'Dynamique : équipements du lot' }}</td><td><a class="btn btn-sm btn-outline-primary" href="{{ url_for('lots.task_edit', lot_id=lot.id, task_id=task.id) }}" aria-label="Modifier {{ task.tache }}"><i class="bi bi-pencil"></i></a></td></tr>{% endfor %}
                 </tbody></table></div>{% else %}<div class="card-body text-muted">Aucune règle préventive. Ajoutez-en une pour générer les échéances.</div>{% endif %}
                 <div class="card-footer"><form method="post" action="{{ url_for('lots.generate_tasks', lot_id=lot.id) }}"><input type="hidden" name="csrf_token" value="{{ csrf_token() }}"><button class="btn btn-success" {% if not lot.is_present %}disabled{% endif %}><i class="bi bi-magic"></i> Générer les échéances maintenant</button></form></div>
             </div>
diff --git a/app_new/templates/lots/task_form.html b/app_new/templates/lots/task_form.html
index 862e414..a7281a1 100644
--- a/app_new/templates/lots/task_form.html
+++ b/app_new/templates/lots/task_form.html
@@ -21,7 +21,7 @@
         <div class="col-md-3"><label class="form-label">Fin de saison</label><input class="form-control" type="number" min="1" max="12" name="season_end_month" value="{{ task.season_end_month or '' }}"></div>
         <div class="col-md-6"><label class="form-label">Portée</label><select class="form-select" name="application_scope"><option value="auto" {% if task.application_scope == 'auto' %}selected{% endif %}>Automatique selon le type d’équipement</option><option value="group" {% if task.application_scope == 'group' %}selected{% endif %}>Une tâche par groupe/localisation</option><option value="unit" {% if task.application_scope == 'unit' %}selected{% endif %}>Une tâche par unité individualisée</option></select><div class="form-text">Pour 30 chaises, « groupe » crée une seule tâche dans la salle.</div></div>
         <div class="col-md-6"><label class="form-label">Périmètre des équipements</label><select class="form-select" name="scope_mode"><option value="dynamic" {% if task.scope_mode != 'manual' %}selected{% endif %}>Dynamique : équipements actifs de ce lot</option><option value="manual" {% if task.scope_mode == 'manual' %}selected{% endif %}>Manuel : uniquement la sélection ci-dessous</option></select></div>
-        <div class="col-12"><label class="form-label">Équipements concernés (périmètre manuel)</label><select class="form-select" name="equipment_ids" multiple size="4" aria-describedby="scope-help">{% for equipment in equipments %}<option value="{{ equipment.id }}" {% if equipment in task.equipment_scope %}selected{% endif %}>{{ equipment.name }}{% if equipment.room %} — {{ equipment.room.name }}{% endif %}</option>{% endfor %}</select><div id="scope-help" class="form-text">Maintenez Ctrl/Cmd pour plusieurs équipements. Les nouveaux équipements du lot sont inclus automatiquement en mode dynamique.</div></div>
+        <div class="col-12"><label class="form-label" for="equipment-filter">Équipements concernés (périmètre manuel)</label><input id="equipment-filter" class="form-control mb-2" type="search" placeholder="Filtrer par équipement, salle, zone ou bâtiment" oninput="filterEquipmentScope(this.value)"><div class="d-flex gap-2 mb-2"><button type="button" class="btn btn-sm btn-outline-secondary" onclick="selectVisibleEquipment(true)">Tout sélectionner</button><button type="button" class="btn btn-sm btn-outline-secondary" onclick="selectVisibleEquipment(false)">Tout désélectionner</button></div><select id="equipment-scope" class="form-select" name="equipment_ids" multiple size="6" aria-describedby="scope-help">{% for equipment in equipments %}<option value="{{ equipment.id }}" data-search="{{ equipment.name }} {{ equipment.room.name if equipment.room else '' }} {{ equipment.room.zone.name if equipment.room and equipment.room.zone else '' }} {{ equipment.room.building.name if equipment.room and equipment.room.building else '' }}" {% if equipment in task.equipment_scope %}selected{% endif %}>{{ equipment.name }}{% if equipment.room %} — {{ equipment.room.name }}{% endif %}</option>{% endfor %}</select><div id="scope-help" class="form-text">La sélection s'applique aux équipements filtrés. Les nouveaux équipements du lot sont inclus automatiquement en mode dynamique.</div></div>
         <div class="col-md-6"><label class="form-label">Si l’équipement est indisponible</label><select class="form-select" name="unavailable_policy"><option value="suspend" {% if task.unavailable_policy == 'suspend' %}selected{% endif %}>Suspendre et reprendre après réparation</option><option value="keep" {% if task.unavailable_policy == 'keep' %}selected{% endif %}>Maintenir la tâche</option><option value="postpone" {% if task.unavailable_policy == 'postpone' %}selected{% endif %}>Ne pas générer avant remise en service</option></select></div>
         <div class="col-md-6"><label class="form-label">Après réparation</label><select class="form-select" name="after_repair_policy"><option value="preserve" {% if task.after_repair_policy == 'preserve' %}selected{% endif %}>Conserver l’échéance d’origine</option><option value="reset" {% if task.after_repair_policy == 'reset' %}selected{% endif %}>Repartir de la date de réparation</option></select></div>
         <div class="col-md-6"><label class="form-label">Entreprise exécutante</label><select class="form-select" name="company_id"><option value="">Interne / non définie</option>{% for company in companies %}<option value="{{ company.id }}" {% if task.company_id == company.id %}selected{% endif %}>{{ company.name }}</option>{% endfor %}</select></div>
@@ -34,4 +34,8 @@
     <div class="card-footer d-flex justify-content-end gap-2"><a class="btn btn-outline-secondary" href="{{ url_for('lots.detail', id=lot.id) }}">Annuler</a><button class="btn btn-primary"><i class="bi bi-check-lg"></i> Enregistrer</button></div>
   </form>
 </div>
+<script>
+function filterEquipmentScope(value) { const q = value.toLowerCase(); document.querySelectorAll('#equipment-scope option').forEach(o => { o.hidden = q && !(o.dataset.search || '').toLowerCase().includes(q); }); }
+function selectVisibleEquipment(selected) { document.querySelectorAll('#equipment-scope option').forEach(o => { if (!o.hidden) o.selected = selected; }); }
+</script>
 {% endblock %}
diff --git a/tests/unit/test_preventive_scope.py b/tests/unit/test_preventive_scope.py
index 785600a..a3bb4cc 100644
--- a/tests/unit/test_preventive_scope.py
+++ b/tests/unit/test_preventive_scope.py
@@ -2,6 +2,7 @@ from types import SimpleNamespace
 
 from app_new.core.models.maintenance import LotTask
 from app_new.contracts.models import Contract  # noqa: F401 - enregistre la relation ORM
+from app_new.core.preventive_duration_proposals import PROPOSED_UNIT_DURATIONS
 
 
 def test_duration_is_per_element_and_group_quantity():
@@ -19,3 +20,8 @@ def test_missing_duration_is_explicitly_unplannable():
 def test_fixed_duration_does_not_multiply_quantity():
     task = LotTask(duree_minutes=30, duration_mode="fixed")
     assert task.duration_for_equipment(SimpleNamespace(quantity=10)) == 30
+
+
+def test_duration_proposals_are_explicit_and_not_historical_fallbacks():
+    assert len(PROPOSED_UNIT_DURATIONS) == 132
+    assert all(value > 0 for value in PROPOSED_UNIT_DURATIONS.values())