USDT (TRC-20) deposits are added within a minutes to hours due to 3-6 confirmations over the Block-chain network. A Block-chain network confirms all transactions detail like sender, receiver, amount of transaction & previous hash. Every single computer in the Block-chain network confirms your transaction with a hash; when the funds appear in the recipient account after that automatically fund will be transferred to your wallet balance usually, such a process takes from up to 30 minutes