After a customer makes a purchase with WooPayments, the funds from that transaction are placed into your account balance.
Normally, funds are subject to a pending period, after which they’re made available for the next scheduled deposit. (You can change the deposit schedule if you wish.) There are no extra fees for these regularly scheduled deposits.
With Instant Deposits, you can request some or all of your available balance to be deposited immediately, up to a daily maximum. These deposits are subject to an additional fee, but the funds will arrive within minutes. Please see the linked documentation on Instant Deposits for more information.