When a model earns tokens from users for any action, as a gift or from a private show, that payment has a 7-day hold on it before it becomes available to withdraw.
When you check in your dashboard about this, you will see 2 amounts. One is the available amount and the other is the unavailable amount, still under the 7-day hold.
For an individual model, the minimum amount to withdraw is $50. If there is not enough to withdraw, you have to wait for any as yet unavailable earnings to pass the 7 days they're held.
This won't matter so much if you are with a studio.
Any studio withdrawal must be a minimum of $100, so if you and 3 other models earn $100 between you, the studio can withdraw that and pay you from the amount. Each studio will sort this their own way, so you may have to wait until they pay you.