Cartel should take less than two hours to complete the mp stuff but you will need three people. I have a session for it tonight that you can join. You need to have played the single player level to be able to play the corresponding level in coop.
Bound in Blood with be the harder of the two. It will require private two sessions at least to do it. One session for the mp sordid achievements and one for boosting the money. It is still doable but the long you wait on that one the harder it will be. I say this is six to eight hours to do.
I know serves close on Saturday I think so there is not much time left.