It was 22.5 hours of cutting. My very first one that I cut a long time ago, I broke on the roof of the barn, so now I ALWAYS start with the hardest part first and I never drill all of the holes I do them as I go along that way if it breaks I still have wood I can use for something else. I only used thick black paper as the backing and put it in the frame to make it secure.
Thanks everyone for the lovely comments I really do appreciate them.
Marg