Well one would have to count how many puzzles occured in KQ4 for example.
Then when the complete TSL series is over with, find out if this game matches that amount or not. MOE for example actually had about the same amount of puzzles as KQ4, if not more.
My guess when its all over it will average to be about the same as at least KQ1 in number of puzzles if not more.
11 puzzles is probably shorter than a Telltale Games episode by half probably (I've never really counted how many puzzles are in an average Telltale episode though). It's a little more than Owl's Quest (KQ fan game) though, LOL (which as I recall had about 7 puzzles).