Bankroll Requirement

Hi all, great site - very informative. I had a question regarding bankroll requirements for a certain game. It's a six-deck (hand-shuffled), one-deck penetration with a stand on S17 and you can only bet at the start of the shoe. Also, you can play and double on split aces. Minimum bet of $25 and no surrender.

What would be the proper bankroll requirements for such a game? Thanks.