If you rush and skip through all content and focus only on the main quest and skip cutscenes I imagine it could be this fast. Also saying it's way to short; Skyrim's main quest took around this time and less, like a few hours, to finish if you did only that.
I see absolutely zero gain in doing it this fast, this ain't a MMORPG, you have no bragging power here. No other players standing in the bank or inn and you strutting around and showing off your shiny new highest level. Show off ones finish time in a game such as Dragon Age also feel completely pointless. It's like skipping every two pages in a book and then telling people one finished in a few hours, yeah so?