Handi, 30 minutes including fitting a heavy latch spring, but I've had lots of practice, you can plan on 1hr after you make the slave pin which can be a wood dowel, doesn't need to be metal. Having the use of the plexi template really makes removing the pins, without marring the frame, a breeze!! I use a fat brass punch to install the pins, but they're not stout enough to remove them, one small enough will bend, the pins are splined and tough to remove, specially the first time.

Tim