There were only 2 "Seasons" or Series if you will with 6 episodes each. Then they came back to do a 2 part Special to wrap everything up. So, you can knock this out in a single day if you got the time. As for the American version, it's an absolute much-watch remake. The first season stumbles a bit because its basically a carbon copy of the original. But the actors portraying the characters have a enough charm to make you stick with it. It's in Season 2 where they just leave what the BBC version started and make their own mark. Even Ricky Gervais has said Steve Carrell's remake is way better than the BBC version. So, definitely check it out!!!