You know you have spent too much time in unix when you use a unix command to remind you it’s time to step away from the terminal, and go feed the dog. Leave does just that.
This will remind you an hour and fifteen minutes from now to leave your command prompt. If you stay put, it will keep pestering you until you go nuts.
(Depending on your distro, leave may not be standard. In Debian, apt-get install leave will get it installed for you)