time will depend on tools you have, type of body your replacing it with, experience, etc. Fiberglass replacement will obviously be more time due to having to find new grounds for all your wires and more. if you've got a new or used metal tube then it'll be probably go quicker. also like most projects things will occur that you didn't plan on, like new body mounts/bushings might be needed, electrical wires, etc. you'll need to remove your fenders from the tub, your windsheild, roll bar, dash and guages wiring harness, steering column, all interior components, brake lights, etc. if your good i'd say a weekend to tear it apart and another to put it back together,(assuming your good and quick)
1979 CJ-5,360,full width 60, front, 14bolt rear,4.10's,Lincoln lockers,SOA front/ 4 link rear, Beadlocks & 42" Iroks!