If you are the only person bidding... I would try to get Time and Materials.
If not I would say to be safe 2 guys 1.5-2 hours per location per man so 3-4 hours a screen.
27" CRT's can be heavy so there is a chance of alot of slow moving up and down with the TV's especially on the 1st few. I had to do 2- 32" CRT's I don't rember and they were a bear for the 2 of us doing them, because they were so heavy. We had to rig a rolling cart to get them in possition so the TV didn't fall and no one got hurt. Make sure you anchor them well and check the brackets, snchors, bolts or whatever a few hours after you put it up and then again in a week as they tend to settle with that weight.
just to look @ for no reason
Best of luck