I just realized I forgot to look on most obvious place, DOS2 steam store page, it sais there minimum space required for the game will be 35gig, so I guess it will demand some time to install (one of reasons why DOS is one of those games that I never uninstalled, if we dont count uninstalling classical and installing enhanced edition)
It seems my guess of 10gig was a littttttllllle bit under size.
http://store.steampowered.com/app/435150/
