300 times the big blind is common for a limit game so 6 X 300 = $1,800 is a good bankroll for a 3 X 6 limit game. Your bankroll is how much total you have to play, not necessary how much you have in front of you when playing. This bankroll is for one game. If you are playing more than one game then multiply your bankroll by the number of games you play. The bankroll should not be used for anything else except playing poker.If you are playing no-limit poker, your bankroll requirements are three times higher since your variance is much higher.