In reply to Yohan:
If it all went fine no one would know or care.
If you get part way, and have a mechanical failure, or meet a unsympathetic copper...whats your plan B to make your check-in on time?
If you didn't make the departure, it would lead to lots of interesting conversations between you, your boss, the client, any rush stand-in, or back-to-back left offshore...and the possibility of a 'special' depending on your role / rig activity to get you out there
Obviously people miss offshore check ins from time-to-time, but during a down-turn I don't think I'd take the risk of standing out.............so plan B needs to be 'solid'.