2 boxes or 100 rounds of both carry and standard, with 4 or 5 different loads. If it runs perfect, it probably will forever. Sometimes shooting a small carry gun too much results in spring, extractor, or other problems. When I go to the range, I usually like to clean out my loaded mags and start fresh. That means another 21 or so rounds each time, if it works right, I clean it and test it with a pencil with an eraser down the barrel. And put it back into service. Honestly I am not going to spend the 3-500 dollars to shoot expensive defensive hollow points, at a dollar or more a round, into paper, if the 100-200 rounds fire, then the likelihood of an fte is the same as it would be with a thousand rounds, as the more you use something the more likely it is to malfunction, and with sub compact guns firing full 230 grain loads, 1000 rounds is a lot of wear on a 4-500 dollar gun.
Now if you are carrying a $1000.00 +, pistol, I would say go right ahead and shoot the hell out of it, as these guns should be good for at least 10,000 rounds before something needs replacing. Now if you don't have a lot of guns, and this is you do everything pistol, then obviously it's going to see more action.
But most of us carry a small gun when not either on duty, or home relaxing. So it's meant for very limited use anyway.
But shooting it every time you go is still important, as your life may depend on it.
I have not been lucky with PPK's as I carried one for many years, "almost 20" but in NY it's a pain in the ass" to switch guns on your license, so when allowed I picked up a 5 shot revolver, #36, and carried that and left the Walther by the bed after 10 yrs, when it started misbehaving.
A revolver is the most reliable gun you can carry, if you don't mind the capacity.
That was what I was talking about, finding out by shooting only 1 gun, that it was not feeding ball ammo or anything else reliably due to the slide loosening, and being fixed twice.