Free spins have a separate wagering requirement even if they are a part of the same bonus. Meaning that you must wager the deposit bonus and free spins separately, even though in the end it will be counted as the total wager amount.
However, if the deposit bonus has been wagered and free spins haven't yet been played, they will be voided. The free spin wagering requirement is different as it depends on the winnings. For example, if the free spin winnings are 25 euros and the wagering requirement is x20, that would mean that a total of 500 euros would have to be wagered for them. And if the deposit is 40 euros, the percentage bonus is 100%, and the wagering requirement is x20, then the total wagering amount would be 1600 euros because (40 + 40) * 20 = 1600.
Both have to be counted together to understand the total wagering amount for this bonus, which would be 1600 + 500 = 2100 euros.
You can see your bonus wagering progress and requirements in the bonuses tab.