Max
It all depends on what type of operation your looking at some i.e Jigsaw do one week on a rig, week off then a week on an Island then week off etc. Then the Real SAR lads
do shift work mostly 24 hour shifts with reduced readiness inside the 24 hours, or you could be in a really cool base with loads of jobs packed into a 12 hour shift pattern.
You would have to look around but most of the working times and patterns are fairly good provided that the base establishment is up to scratch if not then your likely to be nailed to the aircraft, and the crewroom turns into your living room!!!!