Delays in deposits can be caused by a number of factors, such as network congestion or a backlog of transactions. If you have deposited your coin on Gate but have not received it yet, it is important to first check the status of your transaction on the blockchain. You can do this by searching for your transaction ID on a block explorer such as Etherscan. If the transaction is showing as successful, then it is likely that the delay is due to network congestion or a backlog of transactions. In this case, it is best to wait a few hours and then submit a ticket to Gate if the transaction still hasn't arrived. Gate should be able to provide further assistance in tracking down the transaction.