Why some contestants can take vacation after their vacation time used up?

Some of the contestants always take vacation. When he used up all his 60 days vacation time, he was still taking vacation. (I saw his vacation time become 0, but he suddenly had extra vacation time)
I am curious why he always has extra vacation time? Is it possible that he can postpone the game forever by always taking vacation?

Vacation allowance regenerates, iirc at 1 day every 8 days for regular users and 1 day every 5 days for subscribers.