» Fri Dec 14, 2012 3:32 am
It took me around a hundred hours the first time.
Honestly, you're not going to have much time if you just sprint to the quest marker, fast travel to the next location, rinse and repeat. The most amazing moments come from strolling through the wilderness, soaking in the atmosphere and immersing yourself in lore. The game is amazingly detailed, and with all of the lore behind the series, the atmosphere is amazing. I myself have made it past 1000 hours, and have only completed the Main Questline a handful of times.
You could probably complete it in, say, five hours if you rushed. But I wouldn't recommend that - take your time, enjoy yourself. If you're like me, you might forget there even is a main quest!