92 GP intake manifold gaskets, how long should this take?

3.4 L DOHC V6, 87,000 miles. If this does end up being the problem, how many hours should it take to replace these gaskets. This is beyond my ability, and I don't like to go to a shop without having a good understanding of what needs done, and how long it should take. Anyone know what is reasonable? I also have a bad bearing in a tensioner pulley for the drive belt. I did this once before, but if I had to pay a pro the same hours it took me,:banghead: I'd be better off buying a new car. I'd rather drop the car off, and go have a beer. Any ideas on the time this should take?
Thanks.

Well for changing the lower intake manifold gaskets you are probably looking at a minimum of 6 hours. They will need to remove the belt so have them change the tensioner pulley at the same time. They will have to remove the belt so the job shouldn't take any additional time anyway. As for the beer you will need to go for about a 12 pack!