if i remember right spider mites life cycle is 3 days they lay eggs and die pretty much so if u can go in and clean leafs off by hand for three or four days u should really slow the problem down that is if u dont have access to neem and are trying to stay natural organic ect... i always have pest problems, probably because i work at a hydro store and am surrounded by people carrying there problems (pests) and after work i can never change ect before entering the green room and neem oil controls everything i have problems with.