Half an hour? That's doing pretty good. I think my average with an early teenager used to be 3 minutes to blankout. Not quite blackout, but might as well be.
However, I'm known far and wide as a terrible bore.
I honestly can't remember either of the first times I shot with my two sons. I do remember giving the younger one written signed permission to own and carry a Beretta .22 auto (openly, of course at the time). I impressed upon him my confidence in his responsibility to own it. He says he still prizes that scrap of paper.. By the way, this younger one was the first of us to get a CCW when it became legal in Colorado.
Terry, 230RN