I constructed one joint the first day and let it sit overnight. The next morning I gave it my personal strength test. I stood on it. The joint held. This gave me the nerve to proceed, but I must admit I kept expecting to look over and see that the test piece had fallen apart.
Polyurethane glue takes some getting used to.
It is more like working with epoxy than with carpenter's glue. The first lesson you learn is to wear rubber gloves. This stuff is water-activated. In other words, you cause it to stick by trying to wash it off. Even solvents such as mineral spirits are slow to cut the glue.