the first chair is substantially more simple than the two later ones. The first is a flat back with a platform and no apparent cushion. It has some diamond tuck work but no pleats that go over and behind like a chesterfield couch. it also has no wings on the back. The arms look very simple and unless I am missing something, I would personally estimate 15-20 hours for the first pictured one and yeah, the last two pictured ones would be maybe a hundred or so hours, especially if you are learning as you go.
Zane
Zane