@dragonlordsd
You probably already knew this, but it's Awakening-sized based solely on length. Personally, I'm fine with the small cast of characters because in every FE game I've played I only use my 12 or so favorite characters and I end up feeling super disappointed when I get to the final chapter and realize that I only used a fairly small fraction of the characters. Besides, if both Hoshido and Nohr had a cast of Awakening's size, imagine how much work would have to go into character design,supports, personalities,etc. Hoping for so many characters was a little unrealistic.
EDIT: To be fair, the "clones" actually do get a fair bit of development. I.E.: The avatar's S support with Luna, Odin and Lazward's supports and even the Awakening DLC.