Hellomanx: About to buy it because the screenshot I saw are interesting but I've heard alot of great and not so great things about this game and I want to try it out but how long is it? how long did it take you to beat it? I like taking my time and doing as much as possible so I wont rush this game.
No worries. While speedruns do exist, the game itself is designed to be played at whatever pace you enjoy. There are side quests galore, and even sticking to just the main quest would take you at least 6-10 hours to complete.
On top of which, different play styles open up different side quests (magic vs. tech, evil vs. good, joining the thieves guild, which skills you choose to master, etc.) so the game has a high replayability factor built right in. Changing your followers will also change your experience, especially since many of them have something to say to each other.
One protip: Don't play the game without first installing the UAP; and if you're the type to explore every nook and cranny, consider downloading the level cap remover as well. It's been my experience that my enthusiasm for exploration tends to wane when I'm no longer being rewarded so directly for my efforts.