The FIAT payments from our banks are processed at least three times a day. Our system pulls in all newly received deposits from the BtcPremium's account, which are then processed in batches. Certain deposits require administrator permission, so you will not see it in your account right away. This is mainly due to further security checks, which we have to do occasionally.
Depoits are only available in a few hours on your trading account, but it may also could take 1-3 days as well. This process is largely depending on the bank, not on BtcPremium.
In the 'Transaction Requests' menu of your profile, you can find all transactions and their statuses created.