diff --git a/pipekit/repo.py b/pipekit/repo.py
index b2ef192..da54df7 100644
--- a/pipekit/repo.py
+++ b/pipekit/repo.py
@@ -662,7 +662,10 @@ def create_group_run(group_id: int, *, triggered_by: str | None = None) -> int:
 def get_group_run(group_run_id: int) -> dict | None:
     with db.connect() as c:
         return _row(c.execute(
-            "SELECT gr.*, g.name AS group_name "
+            "SELECT gr.*, g.name AS group_name, "
+            "CASE WHEN gr.started_at IS NOT NULL AND gr.finished_at IS NOT NULL "
+            "THEN CAST(ROUND((julianday(gr.finished_at) - julianday(gr.started_at)) * 86400) AS INTEGER) "
+            "ELSE NULL END AS duration_s "
             "FROM group_run gr "
             "JOIN grp g ON gr.group_id=g.id "
             "WHERE gr.id=?",