Sorry Aaron, for the rude answer above.
But if you get professionals to answer, then I think that they will tell you that at least during long distance flights there really isn't much to do during a substantial part of the cruise.
So they will spoil the time much the same way as their passengers, except two things:
They won't sleep.
And hopefully they won't be screeming "booze, more booze" at the FA's all the time.
That means lots of newspapers, books, magazines, maybe a discman. They will probably often be bringing manuals to study for their next simulator test.
Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs