As far as reliability, I'd like it to go 500 rounds without any serious cleaning and still be malfunction free. Any malfunction has to have an explanation...ammo to light for the recoil spring, magazine springs too light for the slide speed, feed lips out of spec on a magazine, or whatever else might cause a problem.
I see no point in worrying about 500 rounds w/o cleaning as my carry guns are carried clean, & a 30 round shootout would be an extreme scenario.
If the gun will run 200 rounds with no malfunctions, shot 50 or so at a time & cleaned in between, or even the 200 straight through, I'm OK with it.
If 500 makes you feel more warm & fuzzy, OK fine, minus the not cleaning issue.
MM
