Hi Iqbal,
If it cancels out after 2 hours and your parameter rdisp/wp_max_runtime is 7200 seconds it means it is actually kicking it off in the foreground.
First check if you have any background processes free at the time and that jobs/are not in suspended mode. If background processes are available select background server and click on start immediately.
Client copy how to for beginners
Kind Regards,
Johan