My thoughts on loss limits
Grifter is of course correct. There is no mathematical basis for a stop loss or win. As long as the game remains good, and one is mentally alert with emotions in check, keep playing. But you will have to move around if you take this approach. As much as you may want to, you can't play at the same store for several hours at a time. "Back offs" are certain to occur, but will be rare if you limit your sessions to 45 minutes or less. Win or lose.
And still there may be some monetary guidelines you will want to consider if you are a big player. Primarily, the CTR threshold. I once got a shoulder tap, and thought I was done. But they were informing me that my next buy in would generate the paper work (some players keep an inventory of chips to avoid this problem). There is also the monetary tolerance of the casino to consider. A 3k win may be ignored at Wynn, but cause a great deal of concern at Samstown. And oddly, mounting losses may get more attention than winning. In a group conversation I had a while back, someone was asked if they ever stopped play because of large losses. His answer was that he never quit because of losses, but that it was probably a good idea. As he received much more heat with large losses than large wins. It is apparently unnatural for someone to continually take a beating when there are so many casinos and tables to move to.
As for how much I'll win, I try to gauge how much the casino I am playing at will accept without getting too upset. But generally my self imposed time limit comes well before that is a concern.