114 quests at the moment, including the main quest. As was stated before you won't get more than 60% in the course of one game. Most likely you'll get about 30-50 quests per game.
How can you compare it in length to Fallout? There can't have been half as many quests in Fallout.
Half as many as what? 114? or 30-50? Replaying Fallout meant doing pretty much the same things in different ways, which was cool, of course. We took a different route. Replaying AoD means getting access to very different quests. The playtime remains about the same though.
Is there any way you can give us a slightly more specific breakdown of these quests? (I have a very particular reason for asking)
How many are one-offs? How many are multi-stage and more involved? Are you counting one multi-stage/complicated quest as more than one in your total? How many require faction membership? Just a general idea would be great.
Let's use Teron as an example.
You have 4 main story quests.
3 quests per faction (House Daratan (different from the main quest), assassins, merchants, thieves, imperial guards) = 15 quests
5 side quests, including solutions to the previously mentioned quests. For example, IF you're working for the Thieves Guild and IF you decide to handle one of the quests in a certain way, then the price for securing an NPC's support is doing a quest for him.
So, overall we have 24 quests plus 7 vignette quests, so that's 31 quests right there. However, when you are playing the game you'll get 1 vignette quest, 4 main quests, up to 3 faction quests, and up to 3 side quests, so that's only 5-11 quests.