Beeboy, good for you, take care of the bees. You will notice mite drop for over a week. Your bees will be more healthy, have a better spring build up. I talk from personal experience, but there is so much research, bonafied research by impressive scientists. I read an article, 18 pages, detailed studies covering 18 months and took into account the tiniest details to provide an accurate assessment of OAV. If you want the article I can post the title. But consider there are many, very many articles covering the benefits of OAV.
Just a note, I have full respect and admiration for those that do not treat. I take a different path and treat. Treating or not treating both camps wish/want the best for the bees. Blessings to the beekeepers.