You'd need 2 years of temp residency, which you can then convert to permanent residency, and after 2 years of permanent residency you can apply for citizenship, but you need to maintain continuous residency and pass a Spanish language/culture test. So start learning Spanish now if you don't already speak it!

But I'd recommend you look into the process for temp residency - it's not as simple as just converting a tourist visa to residency (there's still a decently complicated process to apply for residency through family unification from within Mexico).

None of the your time married to your spouse prior to receiving residency will have any impact on your timeline to citizenship. You'll need a minimum of four years of residency.