Thirty seconds per round in the beginning is too long but far too short at the mid-late game.
I haven't started playing ranked yet because after 30 or so games I know I'm still not ready. I find myself panicking with not enough time to read what's on the board, figure out how to counter my opponent, what to sell, what to pick up to block 3*s, etc. There's just not enough time at the end.
So, how about we do 20 seconds at the beginning and 45 seconds once it hits mid-game. This will keep the games roughly the same time.