The transactions are always instantly sent as in transmitted to the blockchain. As soon as you send it in your wallet, it should appear as a pending transaction.
Confirmations are a different thing, those are required to make sure the transaction does not get reversed anymore. This can take longer or shorter than average depending on how congested the network is and how fast blocks are being found currently.
Yes, the transaction is always instant, but the conformation message depend on the fee structure also. As differne exchanges charges different transaction fee. But if you pay a little high fee then your conformation can be fast but in yobit it is fixed and and when you transfer bitcoin the fee deducted from your account automatically.