What i need is to attach an event to activity so that when task is not finished before desired time than the execution folows additional flow.
This is for example: Developer user task has to be finished before estimated time expires ie 2 weeks before release time to be sure we know when we have a problem.
I could use parallel gateway to split flow and on one branch use timed event but I think it would be better to attach it to user task or even whole subprocess.