Questions to those of you who have played Dungeon Siege 3.

I like these types of games. I did a little research on this game already but, got conflicting results so just wanna try to clear things up about it.

1) How long is this game? I seen some people say 15-20, and others say 5-10? That's a big jump in hours there. Im the type to take my time, explore a bit, and take on many sidequests.

2) How is the online? Any lag? Is there matchmaking or is it done by friend invites only?

3) How many can play offline at a time? At least 2 I hope.

4) How is the DLC expansion overall? Worth the price? Enough Bang for your buck?

Thanks for any replies.

Do I really have to repeat myself?