How much you need to wager to clear a bonus and withdraw your winnings.
A wager (or playthrough) is a bonus condition: before you can withdraw, you need to bet the bonus amount a set number of times. A $100 bonus with a x35 wager requires $3,500 in bets — only then does the balance become withdrawable.
The lower the multiplier, the more realistic it is to clear the bonus. x20–x30 is a comfortable level, x40 and above takes patience. Check the bonus terms before activating it — usually only slot bets count, and live games are often excluded.