I think anything is possible. I've read in many places that it takes many years. But I had CIN II displaysia about 10 years ago. And yes, it happened rather quickly, in under two years. And I know that for a fact because I was very young and know exactly when and who I got the hpv from. So, if you have hpv or some worries about that, I think that it is a very good idea to get a pap every four months if your hpv test is positive and/or you have an abnormal pap. I don't know your situation so I don't want to imply anything. That is just my advice from my experience, because it can get bad pretty quickly, and sometimes waiting 6 months between paps is too long. A lot can change in that time.
Take care
the answer to that is unknown at present..unless u've been with one partner for a long time and had no others....there are more verifiable stats on the HPV virus clearing the body in 6-12 mos.according to the docs under Experts forum.