Re: How long until you have resistant bees?
Back to the original question, if you requeen with a resistant or treatment free queen, your colony will be resistant in six weeks, if done in the spring or summer.
I've been treatment free six years, completely and totally. I've requeened a couple of times, open mated all the time with my walk away splits. Started with two packages from B. Weaver, grew to 32 by last fall. Lost two colonies this past winter. 6 %. Treatment free on large cell.
"If all you have is a hammer, the whole world is a nail." - A.H. Maslow