diff --git a/zmsdb/src/Zmsdb/Helper/CalculateSlots.php b/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
index 097b5ab5b..d257cd5e2 100644
--- a/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
+++ b/zmsdb/src/Zmsdb/Helper/CalculateSlots.php
@@ -183,7 +183,7 @@ public function deleteOldSlots(\DateTimeInterface $now)
         $this->log("Maintenance: Delete slots older than ". $now->format('Y-m-d'));
         $slotQuery = new \BO\Zmsdb\Slot();
         $pdo = \BO\Zmsdb\Connection\Select::getWriteConnection();
-        $pdo->exec('SET SESSION innodb_lock_wait_timeout=120');
+        $pdo->exec('SET SESSION innodb_lock_wait_timeout=600');
         if ($slotQuery->deleteSlotsOlderThan($now)) {
             \BO\Zmsdb\Connection\Select::writeCommit();
             $this->log("Deleted old slots successfully");