Before I stopped playing with the fear that the small lags I was getting would turn into a hudge unplayable game (thanks Bethesda), I was at 85 hours and it felt like only scratach the surface. I tried to avoid Main Quest as much as I could. I was wondering if anyone knew how long this game is, playing everything once with one character, and how many quests are there altogether?

I'm at level 52, 102 hours of gameplay and I have not discover everything.

over 400 total... thats including misc obj. also

In addition to the main quest and civil war there are four major factions, but even all of those quests don't cover everything. By the time my second character had hit level 17 I'd only completed a handful of quests that weren't around Riften (level 17 is when I decided to start the main quest, and then around level 20 I started doing quests around the Reach).

I have 200 hours logged and I still haven't done the Thieves Guild, Dark Brotherhood, Imperial side of the Civil War, most of the Daedric quests, and a large number of regional quests.

my first playthrough i had alittle over 300 misc completed & then there is over 100 main, civil war & side quest UESP & Elder Scrolls wiki have most if not all quest