Also depends on limit or NL. Limit, you can put $$ to the side and know that when your limit bets dip into that stack you will leave on the next hand. NL you may be pushing the money on the side with an AI bet, so no need to put it to the side. I do the same when I play slots
. Say I start with $5, "I'll stop when I hit $10", then I hit $12.50, "I'll stop when I hit $15, or go down to $10"... which is essentially the same as LHE. There's really no way to do this with NL since you may be pushing on a monster.