Update app.py

app.py

@@ -29,6 +29,7 @@ def get_status(credentials, instance_name):
     return status, ip_address
 
 def get_time_remaining(last_start_timestamp, run_duration_seconds):
+    run_duration_seconds = int(run_duration_seconds)
     last_start_dt = parser.isoparse(last_start_timestamp)
     end_run_dt = last_start_dt + timedelta(seconds=run_duration_seconds)
     now_dt = datetime.now(tz=last_start_dt.tzinfo)