Sometimes I clean my guns after shooting them, but mostly they go up to several months between cleanings. Keeping under the extractor star and it's recess in the cylinder clean is most important in keeping a revolver functioning.
I have gone up to a year or more between cleanings. This with a carry gun (mostly field carry), and have never had a functioning issue. If they get rained on they get an oily rag wipe down, but in this dry climate, oil attracts dirt. Rust is rarely a problem.
I used to clean them every time soon after shooting. I became less concerned about it after spending long periods in the hills roaming, without mainanence, and found that the guns continue to work fine. My Smith 29 has a LOT of blue missing from holster wear, and has been one of those that went a year between cleanings, but it's never ever failed to function.