Let's say you have 10.00 in bonus cash and the casino in question has a 20x wagering requirement in order for you to cash out. All this means is you have to spend 20x the 10.00 you received as bonus cash. You would have to bet 200.00 dollars in order to break the bonus threshold. So if you were to do 1 dollar spins, it would take 200 spins to pass the threshold. If you manage to score a win of 1000.00 cash during this time, you can wager the rest of the bonus cash and easily cash out 800.00 (or more depending on how much you've already wagered).