The question "How long free spins last?" is usually about how a slot hands out its wins from one spin to the next. Two slots can list the same return and still feel like different games, because the return says nothing about how the money arrives. Volatility and hit frequency describe that part: how often a spin pays anything, how large the rare wins are and how long the dry spells last. Together they decide what a fixed budget is likely to buy in time at the machine.
Many slots cap the largest win a single spin can produce, often as a multiple of the stake. Once the cap is reached, the round ends and any further winnings are forfeited, which trims the top of the payout range. Games that sell entry to their bonus round list a separate return for the bought feature, sometimes higher and sometimes lower than the base game. Both figures sit in the paytable or the rules, and both change what a large stake can realistically return.
Volatility measures how widely results scatter around the average return. A game rated low pays modest amounts at a steady pace, and a game rated high concentrates its return in rare, large wins, often inside a bonus feature. Studios describe it on scales of three or five levels, sometimes with lightning bolts or bars instead of numbers, and the scales are not comparable between studios. Choosing a level is a matter of taste and budget, while the cost over the long run stays put.
Measured returns drift away from the theoretical figure over any stretch a person can play, and the gap narrows only across millions of spins. Tracking sites that pool results from many players show this clearly: a game can run far above or below its figure for weeks. Demo modes normally use the same maths as real play, so a free session shows the rhythm of a game, although a short demo run says as little about the true return as a short session for money.
Questions and answers
Does demo mode play like the real game?
Demo modes normally use the same maths as real play, so they show the rhythm of a game, yet a brief trial cannot reveal what the game pays back.
How should a slot session budget be measured?
In spins: divide the money set aside by the stake to see how many spins it covers before any wins, and expect long dry runs on volatile games.
How does buying a bonus round change the return?
Games that sell entry to their bonus list a separate return for the bought feature, sometimes higher and sometimes lower than the base game, in the rules.
Why do measured slot returns differ from the stated figure?
Over any stretch a person can play, results drift from the theoretical figure; tracking sites show games running far above or below it for weeks at a time.
Where are payouts for each symbol combination listed?
In the paytable of the game, which lists what every symbol combination pays at the current stake, along with the rules for wilds and features.
What does hit frequency mean on a slot?
The share of spins that return any win at all; one in four means three spins out of four pay nothing, and many hits pay back less than the stake.