A 10X wagering requirement means you have to play through the bonus 10 times before being awarded your bonus money. So, for example, if you were to get a bonus of $50 with a wagering requirement of 10X, you will have to wager $50 x 10 (which is $500) before you can withdraw the $50. The same principle applies to 20X, 30X, 40X, and 50X.