Only two of my pistols have been fired 500 rounds or more. Those two - my S&W Compact 9mm and a CZ Compact - have been fired 1,000 rounds or more. Why only those two? Those two are the ones I carry.
How do I know "500 or fewer"? I don't keep a diary to record the rounds fired with each pistol. I shoot my pistols only at an indoor firing range. And at each range visit I shoot a pistol only as many rounds as are in the magazines I've pre-loaded and brought to the range (I hate to burn range time reloading a magazine). I generally have 5 magazines for each pistol. So during each range session I'll shoot each pistol about 60-75 rounds. I normally take three pistols with me (each in its own carry bag), so during each range visit I shoot a total of 225 or fewer rounds.
Knowing I've taken each of my non-carry guns to the range 4 or fewer times, I can confidently say I've shot each of those pistols fewer than 500 rounds.