How long will this last? Everyone asks it and almost nobody works it out, which is why a session often ends far sooner than expected. 100 euros at 0.50 a spin on a 96% game is about 5,000 spins — and at 2 euros a spin it is 1,250.
Before choosing a stake, not after the money has gone. It is also the honest way to plan an evening: a time or a spin count arrives reliably, where a target such as doubling up does not.
What you have set aside for the session, and are prepared to lose in full.
What you bet each spin. This decides the answer more than the bankroll does — doubling it halves the session.
The return to player of the game, from its own page. The house edge is shown under the field.
Bankroll divided by the expected cost of one spin. Half of all sessions end sooner than this and a few last much longer; nothing here predicts yours.
The same figure as time, at 600 spins an hour. Slots are the fastest way to bet in a casino and the number is usually shorter than people expect.
Stake multiplied by the house edge. The price of one press of the button.
The turnover it takes to get there — the same bankroll recycled through the game many times over, which is how a small edge consumes all of it.