How long does CEX verification take?

I'm curious to know, when it comes to the process of verifying my identity on a Centralized Exchange (CEX), how long can I expect this verification to take? Is it a quick and straightforward procedure, or does it often involve a longer wait time? Additionally, are there any factors that can impact the duration of the verification process, such as the volume of users currently undergoing verification or the specific requirements of the CEX in question? I'd appreciate any insights you can provide on this matter.