How to reassign a task to group one hour after the user just accepts the task and do nothing?

Task escalations are what you are looking for. But, keep in mind, that the time defined here is not based on when the user accepts the task, but on the time of assignment.

docs.appian.com/.../Process_Node_and_Smart_Service_Properties.html

Hi Stefan Helzle (stefanhelzle0001), 

I tried implementing Escalation.
1. In the Timer Event Setup tab, I have set 1 hour in the timer escalate activation.
2. In the Timer Condition, I have given the below expression, if the tp!owner is not null which means the task is accepted & idle (not taken any action).

3. In What action should be taken? I have chosen Reassign task to: and I am providing the group name to which I want to reassign the task. 

The escalation is not getting triggered when the task is accepted. Is there anything else I need to check/configure?  Is the expression to identify if the task is accepted & idle is ok? Please let me know your thoughts. 

Hi Stefan Helzle (stefanhelzle0001), 

I tried implementing Escalation.
1. In the Timer Event Setup tab, I have set 1 hour in the timer escalate activation.
2. In the Timer Condition, I have given the below expression, if the tp!owner is not null which means the task is accepted & idle (not taken any action).

3. In What action should be taken? I have chosen Reassign task to: and I am providing the group name to which I want to reassign the task. 

The escalation is not getting triggered when the task is accepted. Is there anything else I need to check/configure?  Is the expression to identify if the task is accepted & idle is ok? Please let me know your thoughts. 

I am not sure whether this would work. The general issue is, that this timer starts with the assignment, but not with the acceptance.

 Peter Lewis , can you help us out with this? I do not want to spread any myths here.