Only being able to play this for 2-3 hours every night after work makes me sad .
My initial impressions of the game were kinda mixed but by now I am enjoying this game a lot.
Also I might be the slowest player around the block. My save says I am at 20h game time and my next story mission is mission 8! To be fair though, I have beaten every sidequest and got gold on every challenge so far. I am also pretty positive I have bout 99% of all existing gems in the first city. Yep, I check every single building extensively!
I'm where you are at 15 hours so glad to know I'm not totally alone.