Assuming someone does nothing it could take a few years to establish resistance to HPV. If an individual takes the author's suggestions, it requires just a few months to establish resistance to HPV virus. The longer somebody has HPV, the longer it might create damage. So it is preferred to develop immunity so as to eliminate HPV as quickly as possible.
https://www.storeboard.com/blogs/general/12-stats-about-hgsil-pap-smear-to-make-you-look-smart-around-the-water-cooler/2572986