diff --git a/src/LevelAgreement.php b/src/LevelAgreement.php
index 6755c205c03..75185106b6b 100644
--- a/src/LevelAgreement.php
+++ b/src/LevelAgreement.php
@@ -203,7 +203,8 @@ public function showForm($ID, array $options = [])
         echo "<tr class='tab_bg_1'><td>" . __('Maximum time') . "</td>";
         echo "<td>";
         Dropdown::showNumber("number_time", ['value' => $this->fields["number_time"],
-            'min'   => 0
+            'min'   => 0,
+            'max'   => 1000
         ]);
         $possible_values = self::getDefinitionTimeValues();
         $rand = Dropdown::showFromArray(