5 min break can go by pretty darn fast. Boil the kettle have a smoke, pee, and you're pushing it.
On the other hand the longer you're away from playing poker, you might mentally check out for a bit.
All and all, I say 5 min break is all right. If you just gotta do something, then Sit Out Next Hand, or retire for the afternoon/day. Or go all-in every hand.