It's 5 days
http://forums.awakenedlands.com/showthread.php?tid=1896
Quitting and Getting Fired
Any job can be quit without fear of penalties. However, you cannot quit a career if you have already worked an hour in that career during the current day. Once an hour is worked during the current day. you will be locked in until the next-day's refresh.
If you are inactive for 5 or more days and have an active career selected, you will be fired by your boss for poor work performance. Being fired is costly, as you will lose a rank in that career if it is above 1.
Speaking of which, is it 5 fully inactive days of the players or 5 days without working at least 1 hour?!?!?
Zen??