I'm not sure about hours because I don't see it or dont remember but I can remember being able to go through one whole day playing it except for breakfast lunch and dinner on weekends. but on weekdays I guess as soon as I got home till 12 am! haha
i played a lot with one character for hours and hours, maybe days even. then when i went to restart and make a new character, i got completely bored with story and sidequest. it was a fun experience, but it expired after a while
I think I've played Skyrim for somewhere around 650-700 hours and still counting. The game is boring sometimes because I've beat almost everything in the vanilla and DLC version but I manage to find things to do.