In answer to your question, it would take me about two hours, once the rebuilt calipers were in hand. How long it takes you is a different story. One thing I suggest is new hardware kits for the rears (new pins and crosspieces), that will eliminate a lot of rust. Doing the parking brakes? The parking brakes always have issues as these cars age. You may find the cables seized or the compensator rusted solid.

What are new pins and crosspieces? Would you happen to know the part numbers for pins, cross pieces and for the parking brakes, cables and compensator?