Once the client has authorized the withdrawal by clicking the link in the Withdrawal Approval email, it will be submitted to the blockchain shortly after that.
Different cryptocurrencies can be faster than others, depending on where the funds are being sent.
Some exchanges and wallets require a set number of confirmations before showing the funds in your destination wallet. Contact your external wallet support to find out their protocol.
You can track all of your crypto withdrawals on our Blockchain Explorer.