Dan at Quad 4x4 says it takes anywhere from 15-20 hrs. i had previously removed the old getrag/transfer-case so that i could take him my flywheel. all in all it took all day Saturday and finished up Sunday around 2:30pm or so. there are no frame mods. . there is a little work to do on the transmission support plate
and some mods to the transfer case shifter bracket. the worst part for me was cutting the carpet. . i felt if you screwed up on that, then everyone would see it. you need a welder and a grinder and probably a torch or chop saw. the kit i got was very complete and to the point. you could probably shave some time of the install if you have a nice warm place to do it. i was stuck out side with snow on the ground and highs in the mid 30's. also i did everything by myself wishing i had someone to help.
good luck
nick