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TOTP usually only allows for about 30 seconds of time drift between the device and the server. If you really must set your phone to the wrong time you can use a cheap second device, or a hardware token.

Technically if an authenticator app has an option for a time offset it should work, but I've never encountered one.

Synchronize your clock.

I want my clock to be sped up by 15 minutes.

You could fork some open source TOTP app and change the time generation.

Or you can save your code and wait 15 minutes to login.

Why?

I watched a TV show about the Queen of England and I use her trick to never be late.

Write an app to do the +15 for you.

There must be at least 7-8 other people in the world would pay for this.

GitHub offers like 4 ways to do 2FA. On top of that, your browser or password manager can probably also generate OTP.

If you can get oathtool from fdroid termux, it can generate a "not-now" TOTP token for you if you still have the OATP parameters.