One of my rifles, I haven't sighted in ,.... for years!And it is always on. But, then again, I guess just shooting it is checking it, so I guess I should say I have never had to adjust it in yeras, instead!

Others are pretty good about staying in, some it is more a problem with ring screws. I don't like lock-tight. But, overall, if I don't abuse them, they stay in consistently.
Contrary to many others,... I feel excessive shooting to be over-rated, unnecessary and detrimental to my weapon. When I am just MAINTAINING familiarity with a piece, 3 or 6 rounds once a month does it for me. If,... I,... am sighted in.

Maybe a dozen or so if it feels like it just needs some more.
Now, playing around!!!! Different story,... and 50 to 100 rounds is common.
