I've read lots of info on managing a poker bankroll and how much to use towards a long-term poker career and a session, and the general consensus seems to be that if you want to be playing poker long-term, it's a good idea to use no more than 7% of your bankroll at one session, but preferably as low as 3%. If you're playing limit, that amount should be at least 100x the BB, and if you're playing no/pot limit, that amount should be at least 500x the BB.
I've been pretty much following those guidelines (5% of my bankroll) and it's been working well. The difficulty I have is when I play MTT tournies that are very challenging to win; namely qualifiers and satellites.
In cash games, I think it's reasonable to say that if you play a decent game, you have a decent chance (40% or so) to make a profit. At single table SNGs, it's generally 25-33% of the players who cash. However, many qualifiers are extremely tough, only offering rewards to anywhere from 1% to 10% of the field.
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