I was on call for years for a global lottery software and services provider in a 4 man rotation 1 week each. Took people 3-5 years to be ready to take on this responsibility. The last few years i was alone as people left with stress and i was 24/7 365. The pay was good but the day my new boss told me he didet get paid so i could escalate at nite and nobody could find a solution for months i started to look for new oppertunities. They hadent tried to prepare new people for years but managed to get a guy who was not ready to take the call but it also resulted in major incident and data loss. By the time i got out i had constant tinitus so i could barely hear on one ear from the stress so Im pretty happy Im done with it now but Sometimes miss the action ;)