I usually will go with a £10 cash game try and double my money then I leave. And start again so if I loose next time I still have my original £10. Does anyone else do this or something similar? Wish poker stars had the option to put money in ur account from the money at the table so I don't have to leave and come bk.
There is variance in the game that will cost you your stack from time to time. If there are multiple tables available, and you wish to bank a profit, why not.
But I would not put a number to it. That is just limiting. Look at reasons such as table players change, the easy money is gone, the guy on tilt is gone, good player sits to your left, something irritates you, you are getting tired, starting to tilt, getting hungry, played too long etc etc
If you are playing and you are not bringing 100%, total focus, optimal game THEN take a break until you can !