This was my first thought after OP edit, lol, good luck doing this all yourself under the time limit. OP needs to educate themselves on 2FA methods.
Google authenticator exists, but I'm trying to get google out of my life. I think Bitwarden has one. I'm only using Authy because it was among the first to offer a backup/restore solution that I stumbled on.
Those apps keep track of it for you, you can use any 2FA app that supports TOTP. You could even make your own if you want.
https://en.wikipedia.org/wiki/Time-based_one-time_password