How to Work with DeadLine Monitoring : Basic understanding required

Hi my scenario is ,

The user needs to approve the process . if he is not approve with in 5 mins , it should a mail to him again as requesting to approve .

In order to meet this scenario , i have created a user Decision in my workflow , in decision tab for the user decision i have mentioned my username in agents.

Then in the Latest end tab , i have selected refer.Date/time in the Workitem creation tab , and 5 mins i choosed in the time text box.

in display text i assigned my user name again .

inoutcomes tab i have activated the processing obsolete ( But i am not clear what is the use of this )

after the userdecision i created a sendmail step below of approved and rejected.

and workflow completed , no error ...

when i exected this workflow , it is not sending any escalation mail as i mentioned .

what could be the problem ?? it is still showing the inprocess status in the workflow log... workitem is there in my inbox.

Message was edited by:

Prakash N