Well here's what I know about treating ear mites with Revolution/Stronghold, some foot in the ear scratching is the drops working and have the mites moving around in discomfort, as far as how long before earmites are gone using Revolution/Stronghold, depending on mite infestation, I've seen it take some 3 to 4 app's (3-4 months) to really get mite population under control, others I seen 1 or 2 app.'s do-it........Liquid drops is the quickest way to knock out mites, but like in my case, drops are not possible........
FYI, I use Stronghold Plus, it's the same thing as Revolution outside the USA and whole lot cheaper, $42. bucks for 3 app.'s........petbucket.com, I've bought my Stronghold Plus there for many years, it either comes out of southeast Asia or out of France, no doctor's script needed and delivery in 10-14 days..........