They appear as soon as you open the slot in which you were granted online free spins. Depending on the terms that you accepted, you might have to cover wagering requirements on winnings only. That is an advantage compared to regular money bonuses, as they imply wagering requirements on the received amount, regardless of winning or losing.
Of course, big wins result in bigger wagering requirements as well. Let’s take an example:
Example:
You received 50 free spins on 1xBet to play Book of Dead by Play’n Go. Each free spin equals $0.20 (~?11), and the wagering requirements are 30x your winnings.
After spinning all 50 and having lots of fun without affecting your bonus or money balance, you have a total of $20 (~?1,100) in winnings.
Therefore, you need to wager 30 x 1,100 = ?30,300 to be able to withdraw. If you had not won anything spinning, there would be no wagering requirements to be covered, and withdrawals would work normally.
Like any other bonuses, casino free spins come with a maximum time to be used and to complete the possible requirements. Also, they might have a maximum winnings limit, depending on where you play.