Michael,

Congrates....
it doesnt matter how long you took but what matters is that you have soloed and you are really interested in flying.(anyone can 'drive' those rc cars but not all can 'fly' a plane.)it requires lots of experience to fly a RC plane well and you will learn something everytime you fly.(not insulting those RC car dudes ok!!)
you should stick to one instructor only as he will know you better and know what you capable of doing and teach and correct you on what you dont know.

Good luck.