diff --git a/backend/app/services/zigbee_service.py b/backend/app/services/zigbee_service.py
index a5fbd12..4b6222a 100644
--- a/backend/app/services/zigbee_service.py
+++ b/backend/app/services/zigbee_service.py
@@ -18,7 +18,7 @@ except ImportError:  # pragma: no cover
 _NETWORKMAP_REQUEST_TOPIC = "{base_topic}/bridge/request/networkmap"
 _NETWORKMAP_RESPONSE_TOPIC = "{base_topic}/bridge/response/networkmap"
 _CONNECTION_TIMEOUT = 5.0   # seconds to verify broker reachability
-_NETWORKMAP_TIMEOUT = 180.0  # seconds to wait for the networkmap response (large meshes can be slow)
+_NETWORKMAP_TIMEOUT = 300.0  # seconds to wait for the networkmap response (large meshes can be slow)
 
 
 def _sanitize_mqtt_error(exc: BaseException) -> str:
diff --git a/frontend/src/components/zigbee/ZigbeeImportModal.tsx b/frontend/src/components/zigbee/ZigbeeImportModal.tsx
index fbc002a..865207a 100644
--- a/frontend/src/components/zigbee/ZigbeeImportModal.tsx
+++ b/frontend/src/components/zigbee/ZigbeeImportModal.tsx
@@ -309,6 +309,9 @@ export function ZigbeeImportModal({ open, onClose, onAddToCanvas }: ZigbeeImport
                 Fetch Devices
               </Button>
             </div>
+            <p className="text-[11px] text-muted-foreground italic">
+              Fetching the network map can take several minutes on large meshes.
+            </p>
           </div>
 
           {/* Device List */}