For autos, I've always gone by the criteria @DocGKR has espoused as I thought it was pretty good, that is, 1000 rounds without a stoppage to vet reliability (not all at once or without cleaning, just in general).
I've often wondered if this same standard should be applied to revolvers, or if it doesn't take that much. As it is, I've been going by 1000 rounds of Magnum as optimal to vet reliability. Sounds like that may be overboard.
Regarding IDPA match or similar with vetting, how many rounds in what period of time could one simulate that on the range by oneself?