Completed the game on hard yesterday. By estimation it took me close to a month (25-26 days) to play the whole game considering I've played Cyseal for the 3rd time since the BETA came out. Playing GOG version so I have no idea how many hours that is.
Hope D:OS sells a million without resorting to any sales cut. It's back up to number 1 spot on steam fortunately. They've hit 250K few days back and if things are slowing down, I think 500K or 750K might be a more realistic goal without resorting to sales.
Thats quite a longtime considering you put a lot of hours into gaming generally (i think).... Well DOS has already been on sale during early access on Steam... that does count ;)