The real problem at the moment is getting all the old farts JAR certified, this has caused great stress on the current workload.
Most, if not all of the four ringers had to convert their old Norwegian licences into this new heap of JAR s**t.
So until everybody has been re-licensed there is a great manning problem.
The answer to your question is when you are not in control of the purse strings, i think it depends upon safety issues and descisions made on deck at that time.
There are always margins for such events to happen. Depends upon the captains and co/jo agreeing, and then stuff like fuel, weather and wether the rig has a good reputation for a tasty meal onboard
Maybe you should look to ask on the nordic forum too, there may be some useful knowledge there aswell. Me thinks the rest of the rotorheads are boning up for 8 million hours of JAR exams
