Some years ago we were on chocks half way round the worls 2 hours & 57 minutes into discretion. We came very close to a go-round due weather and a 40 minute diversion.
Never, never again. It was quite the most unpleasant experience sitting up there in a stronger than forecast headwind with the possibility of landing illegally.
The company can sack you but the CAA can remove your licence. Stark choice but one that you must keep in your mind all the time.