If this is *NIX, another way to do it might be to arrange for cron to call killall (or kill if you know the PID; e.g. your script could write it to a file at a known location) at 11:30 the next day, and set up a %SIG handler for that signal in your script for a graceful exit.

In reply to Re: Self terminating a script after a specified time by Anonymous Monk
in thread Self terminating a script after a specified time by shardservant

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