I think everyone need's a break from Poker now and again, It all depends on the individual on when and why?
Some players will lose too much and cannot afford to lose more, that particular week or month, others may get bored with the game, it is all due to personal reason's.
I usually slow down when I start to lose, take up reading Poker books, or watching Poker videos on You-tube and switch, they help to make you understand that all the bad-beats and suck-outs you suffer, also happen to the Professionals in Live games as well as on line.
The only real difference is that on-line they happen more frequently, but only because you play a lot more
hands per hour, than you possibly could playing Live.
The only real time I take a break from Poker is usually when we go on Vacation somewhere, where there is no Internet, no Casino's because we prefer to get away from all that and just relax for a couple of weeks.
When the fun Stops, STOP!
(it's that simple)