The "TIMEBOMB IDLE" reported by QUERY SET is not related to the 15-minute
logoff, so you do not need to touch it. (TIMEBOMB as shown by Q SET refers to a "diagnose" instruction that a virtual machine can issue. It allows the v.m. to manage its own CP command(s) to be executed if the v.m. does not reissue the diagnose to cancel or reset the timebomb before the time expires.)
