This has probably been asked more times than I can even imagine, so pardon the cliché.
I plan to apply to quite a few schools (yes, I know the danger in this, no need to tell me). I was wondering if, when having teachers write my letter of reccomendation, I give them multiple addressed envelopes. About how many teachers should I ask? I know schools typically only ask for two, but I don't want to have to give the same two teacher that many envelopes?