It takes 2 confirmations for your bitcoin transaction to be credited to your Gate.io account balance. In general, 2 confirmations may take a few hours.
However, if your deposit is sent with a low fee, it may take several days or even weeks to be included in blockchain. In such case,your deposit may be still in pending status on your gate.io account when it is confirmed on blockchain later.
You may submit a ticket with your transaction id and we will add it to you. https://support.gate.io/hc/en-us/requests/new