This can vary a little from site to site. However, in most cases, Bitcoin casinos can typically process your cashout instantly. You should note that some sites may have pending periods before they process your cashouts and others require you to go through the KYC (know your customer) verification process which can slow things down the first time you wish to cash out. However, the general rule is that BTC cashouts are faster than virtually all other forms of payment methods, including e-wallets.