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  • The “soft” run time limit (-l s_rt) is seven days. If a job reaches this limit, it is sent a SIGUSR1 signal.

  • The “hard” run time limit (-l h_rt) is eight days. If a job reaches this limit, it is killed with signal SIGKILL.

The idea of s_rt is intended to warn jobs that the hard limit is coming. It is up to the job to correctly interpret SIGUSR1 as “Tidy up as you will be killed soon”. In reality most software, including shells, exit exits when they are sent a SIGUSR1.