In Ohio, you receive the certificate about 3-4 months after results are certified. So, I'll get my certificate sometime in March, I believe. I am traveling for two Saturdays in March, though, so I hope it's one of the other weekends! (I'd like to attend the ceremony).
However, I received my wallet card showing my registration and number about a week and a half after my registration became active. My registration became active the day after I got my exam results and was listed in the online license directory. That only happened that fast because I dropped my registration fee off in person on my way home. (My office is only about 5 minutes from the state board's office).