if he had mites the dont wait any less than 2 months AFTER YOU SEEN YOUR LAST MITE. mites reproduce on a 28 day cycle. so you may rid teh snake of all mites then 2 weeks later a whole new batch will hatch and you will be starting all over again with the treatment. that is why you must treat every 2 weeks for at least a month and half to 2 months when a mite is discovered.
im very glad that i havnt even sen one for many years.
adam jeffery