--- scripts/restaurant/customer.gd
+++ scripts/restaurant/customer.gd
@@ -348,7 +348,23 @@
 	# donnee perdue, pas d'un reglage. On retombe sur la valeur d'auteur.
 	if resolved <= 0.0:
 		resolved = fallback
+	if phase in [ServicePhase.ORDERING, ServicePhase.AWAITING_MEAL] \
+			and restaurant != null and is_instance_valid(restaurant) \
+			and restaurant.has_method("order_supply_patience_ratio"):
+		resolved *= float(restaurant.order_supply_patience_ratio(self))
 	return maxf(0.1, max_patience * resolved)
+
+# Adjust the allowance when supply changes without restarting the countdown.
+func refresh_order_patience() -> void:
+	if not has_live_order() or service_phase not in [ServicePhase.ORDERING, ServicePhase.AWAITING_MEAL]:
+		return
+	var allowed := phase_patience(service_phase)
+	if is_equal_approx(allowed, phase_allowed):
+		return
+	var spent := maxf(0.0, phase_allowed - patience)
+	phase_allowed = allowed
+	patience = maxf(0.0, phase_allowed - spent)
+	queue_redraw()
 
 func phase_is_wait() -> bool:
 	return phase_patience(service_phase) > 0.0