lol i guess you're not too interested in getting any sleep tonight my man. i don't really have any experience with snorting lines of meth so i don't think i can answer your question. anyways, why are you asking how long you should wait, are you worried there will be some negative side effects? i don't think the meth would do anything but keep you going longer if you take it after the adderall which is basically straight amphetamines itself.