I remember that the issue was that we quite easily fulfilled the sectors since you could easily do 5 sectors an hour but then it took as while to fulfill the hours requirement which I can't remember but one of the current crop of offshore boys should be able to tell you.
I think in the end it depends on the operation and the number of training captains available.
I believe it should be down to the training captains to decide how training is necessary, with a minimum of say 25 sectors and 10 shifts.
The more training the better of course.
It's been ten years since my offshore training so it's all a bit misty in my head.