Being a rifle instructor with decades of experience.
I can tell you give me a person with a lot of motivation.
I can instruct them in an hour to be a very good shot at the distance mentioned.
I can also work on the human factor. that is a bit more difficult. With instruction it can be worked on in that hour.
I took my adult daughter to the range to teach her to shoot. In one hour she was hitting the inner circle of the target (not the bullseye) from 150 yards. She had never shot a rifle before.