diff --git a/data/grid5000/sites/nancy/clusters/grat/nodes/grat-1.json b/data/grid5000/sites/nancy/clusters/grat/nodes/grat-1.json
index bfce356b636ec44f9d6f91581e98576012835551..bf506151cc7a24efb014a20d8994edf842a52a38 100644
--- a/data/grid5000/sites/nancy/clusters/grat/nodes/grat-1.json
+++ b/data/grid5000/sites/nancy/clusters/grat/nodes/grat-1.json
@@ -414,7 +414,7 @@
   "supported_job_types": {
     "besteffort": true,
     "deploy": true,
-    "max_walltime": 0,
+    "max_walltime": 604800,
     "queues": [
       "admin",
       "testing"
diff --git a/input/grid5000/sites/nancy/clusters/grat/grat.yaml b/input/grid5000/sites/nancy/clusters/grat/grat.yaml
index 990d2f51bc433d3261922543fada881db2ac2ec0..f92b3d89dc44d93a30dde333f5eb561c96b69def 100644
--- a/input/grid5000/sites/nancy/clusters/grat/grat.yaml
+++ b/input/grid5000/sites/nancy/clusters/grat/grat.yaml
@@ -11,7 +11,7 @@ nodes:
     supported_job_types:
       deploy: true
       besteffort: true
-      max_walltime: 0
+      max_walltime: 604800
     processor:
       microarchitecture: Zen 3
       clock_speed: 2100000000