No, two hours as in an amalgamated two hours. :T And I do a lot of musical theatre performance and non-serious voice acting, but to answer your question no, I did not take any formal classes.
I'm working on a few more Fluttershy reels, but I'm not happy with the way my speaking voice [as opposed to my murmur voice] currently sounds, so I'm tweaking things about it. And yeah, I should just give up on Rainbow Dash-ing.
I've uploaded two new impressions; a "better" [in my opinion] try at Rainbow Dash, and a tidbit of Fluttershy~
http://soundcloud.com/zephyr-blue/fluttershy-reel
http://soundcloud.com/zephyr-blue/rainbow-dash-reel-1