The Blackpool operations ain't that boring since you can do something 10 landings an hour or 24 in 6 hours.
Humberside you get longer legs so it may be half that.
Aberdeen it takes a minimum of 45 minutes before you reach any rigs but you must ask the puma guys that.
It also depends very much on who you are crewed with.
But if you only do it for 3 -5 years you should be able to cope.Also the money makes up for a lot of it.