Your question isn’t clear to me.
Anyway, if you set 2FA (which you will be asked for with most of the reputed sites), you will be asked for code on every time you log in or withdraw fund. In case of coinbase, I used my number only and I am required to use the code everytime I try to withdraw fund.
Well, on BlockFi I log on and off a couple of times every day and am only asked for my userid and password. This makes me wonder if I should try a small withdrawal to see they ask me for anything else. Coinbase sent me a one time code to use to login after my having been locked out, but I don't know if I will ever be asked for any other code. To clearify, each time I went to login on a different device they sent me a code to use during the login process.
If I am asked for any code when withdrawing funds, I would have no idea what to enter.