If Skyrim is as good as everyone says then bye bye spare time! :)
I was not into RPG games at all but the Bethesda ones are time-sinks. I spent 200h on Oblivion, 175h on Fallout 3 and about 90h on Fallout NV (and still have a couple of DLCs to go & then finish the main quest)
I got Skyrim yesterday as well but I want to tweak it a bit before I get into it (my first observations are that it does need some decent graphical tweaking as it isn't maxing my CPU + GPU yet is dropping to 25fps it some areas in the intro)