Thanks for the advice ya'll. I may just start telling new people who want to start that I offer 45 minute lessons to all students (except those who I know are too young to go that long... or maybe I know I can't keep their attention span that long). I may just inform parents after the first month of lessons that they're just too advanced and old to have simply 30 minute lessons. Shouldn't be a problem I don't think.
Thanks agaiN!

"Practicing is the key to success"