Add stats for fast/slow players

Many users don't like too slow players and even write about it in match names. Is that possible to create new stats like "how fast his games was"?

Server can save time of each player and then calc his median value. E.g. player 1 take 5 mins per game last week, but player 2 take 15 mins per game (time_factor = player_time / total_game_time or even actions per time). And show up that stats for player info window (yep, it can be implemented too).

Is that possible and relevant? Can be pitfalls like slow blue deck guys, different game modes.