I guess my shooting time is pretty average. That is good. I was getting worried that I'm working way too hard at this for the little progress I seem to be making.
Maybe I should try shorter sessions, twice a day. It couldn't hurt me to fling a few in the morning in the back yard. I usually shoot 1.5-2 hour sessions about 4 times a week, sometimes more or less.
Carpshooter just gave me an idea. Of course, it will be a long time in the future, but if I ever make my dream of a custom home, a design feature will have to be a long hallway, preferably with a hearth or some other indestructible object at one end. (But maybe smarter [not necessarily more] practice, and I won't have to worry about missing by then.)