script to monitor the process system when a process from user takes longer than 15 min run.

get email notification from from system when a process from XXXX user takes longer than 15 min run.Let me know the time estimation for the same.

hi ,any one please tell me , how to write a script to get email notification from system when a process from as mentioned above a xxxx user takes longer than 15 min run

Write a script which:
1- Get the PID of the process when launched
2 - write a script which will be executed by the first one to check if PID is till there, and execute the script using at command (for the check after 15min...)
The rest you should know how to...