Today, I have fired the most numerous number of rounds so far in all my range trips: 800, which consisted of 500 9mm and 300 .22LR. This feat took me 3.5 hours of range time; people came while I was there and the same people leave while I was still there :)
I have never fired so many, and I noticed that I can actually get tired from firing a pistol even with some breaks. Towards the end my hands where shaking while trying to align the sights.
I find 800 rounds is probably too much for me for 1 trip :)
Usually I have some goals I work on when I hit the range, but today is different. I show up for a match and nobody was there (I got the date wrong). So I went home picked up more guns and ammo and hit the range. I have no goals besides burning up ammo and watching holes appear on a paper. I only saved my last target comparing a G19 and HK P2000; usually I save most targets for future reference.
Anyway, I've shot 800 rounds in 1 range trip. Top that! (spoken in a friendly tone...)