I don't see it taking three times as long, but quite surely more cutting. I am looking for short cuts, ways to lessen the time. Surely not on braces and or to hide a mortice after a few years of drying.
I do a similar cut to the tenon on a english tying post, the one going into the bottom of the tie beam. The post is flared or fan tailed and is 13"x9" at the top. The plate uses up 6" and the tie tenon is 6" leaving 1" on the shoulder as you have shown. I do this because in the past I have been left with a 11-1/4" post top and had to make adjustments I didn't like. So now I saw them a bit deeper and have plenty of wood for my tenons. Also this is the case when the post has a live edge on the inner face, plenty of wood then. Tim
