im currently 10.5 hrs in and just leaving cartmans house for the 1st night. Not sure how long the rest of the game is but its still been worth the $45 I paid.
Wow. You spent a lot of time screwing around didnt you? You are about 1/3 or 1/4 into the game.
I did a lot of sidequests (atleast all that I could find) and I finished the game in about 14 hours.