diff --git a/backend/src/Controller/StatusController.php b/backend/src/Controller/StatusController.php
index aad0bbb..af95f45 100644
--- a/backend/src/Controller/StatusController.php
+++ b/backend/src/Controller/StatusController.php
@@ -38,7 +38,9 @@ class StatusController extends AbstractController
             $now        = new \DateTimeImmutable('now', new \DateTimeZone('UTC'));
             $ageSeconds = $now->getTimestamp() - $detectedAt->getTimestamp();
 
-            if ($ageSeconds <= 6 * 3600) {
+            // Sentinel-3 : quotidien. Sentinel-2 : toutes les 5 jours.
+            // 48h couvre les gaps weekend + latence de traitement.
+            if ($ageSeconds <= 48 * 3600) {
                 $healthy = true;
             } else {
                 $alertReason = 'stale_data';