You might play at a smaller or larger amount than $1 per spin, or you might spin at a lower or higher rate than 600 per hour, and as is always the case in gambling, even though the machine might be set at 90% return, you could win or lose at much different ratio, remember that 90% return is based on large numbers, in the short run of a couple of hours or even a couple of days it might return zero, of course you could also hit a jackpot or two, that’s why it is gambling.
Also if after doing the above calculation for your style of play you find it more money than you can afford, then adjust. You can adjust the amount per spin, numbers of spins per hour, playing time, etc.
You can also back into this calculation, by saying something like I am comfortable with $1000 total bankroll and I want to play $2 per spin at 400 spins per hour, how long can I play.
Using this scenario you would multiply 400 spins times $2 for $800 in total play per hour, with a 90% return of around $720 or about $80 per hour, so with $1000 bankroll you could play those one-armed bandits for twelve and a half hours, or about four hours per day.
Or you might say I want to play four hours per day. In this scenario you would divide $1000 by 12 (four hours times three days), the result would be approximately $80 per hour, so you could play $2 per spin at 400 spins per hour.
There are many way to calculate your bankroll, these are just a few, but proper session planning and bankroll budgeting in advance will make your stay more enjoyable and less likely to find you broke on the first night!
Now I know I started this blog off by saying you take you money to win, not lose. Then I calculated how much to take based on losing, so you are asking, why the contradiction?
Well, in the above formula the amount of your bankroll is based on playing time vs. house percentage, over the long run this will probably play out, but over the short run of a few hours or a few days anything is possible, both losing streaks and winning streaks. As a proponent of the “Law of Attraction”, I am taking my money to attract one of those winning streaks.
Know your play. Know your way.