System timeouts can be set for your mailing system. You can set any of the system timeouts from five minutes to four hours, in one minute increments.
Default Job Timeout -The default job timeout option allows you to specify how much time you want to allow the system to remain idle before the default job is reloaded on the Run Mail screen. The default timeout is 20 minutes. If necessary, this timeout can be disabled.
System timeouts are set within the Settings application.