diff --git a/golem/task/taskmanager.py b/golem/task/taskmanager.py
index 5993c3cfd9..07e27ed725 100644
--- a/golem/task/taskmanager.py
+++ b/golem/task/taskmanager.py
@@ -1062,7 +1062,6 @@ def get_task_dict(self, task_id) -> Optional[Dict]:
         state = self.query_task_state(task.header.task_id)
 
         dictionary = {
-            'duration': state.elapsed_time,
             # single=True retrieves one preview file. If rendering frames,
             # it's the preview of the most recently computed frame.
             'preview': task_type.get_preview(task, single=True)