Deposit of cryptocurrencies may take from a few minutes to a few hours, in rare circumstances, depending on the blockchain. The average mining rate of, say,  the Bitcoin blockchain is around 10 minutes. Once the transaction is included in a new block, we have to establish that is it s a permanent one. Without a number of confirmations (each mined block in which the transaction is included adds to the confirmations), we cannot credit the deposit to your wallet. This is done to avoid double spending. The transactions can always be tracked from a blockchain explorer, or from your private wallet.