Bankroll for playing Headsup SNGS on STARS

[Lmn55d]

I started playing these headsup SNGS on stars to get better at Headsup and prepare for HULA and the Baronzeus tourney...they are pretty fun. I am just wondering what sort of bankroll one should have to play these? For example, if I am playing the 10+whatevers, how many buyins should I have? I know it depends on my winrate for the game, but I'm not really familiar with the variance in these nor do I know how good I am headsup...so what would you guys suggest?