I don't know specific numbers for breathing rates, but they breathe like us - when they're relaxed, their breathing rate is lower, and when they're excited, stressed, or worked up in any way their breathing rate (and their heart rate for that matter) will increase.
The only time you really need to worry about your snake's breathing is if you see it gaping its mouth and trying to mouth breathe, or if you hear wheezing/whistling/popping when it breathes or if you can see mucous bubbling around the mouth and nose. Any of those - or any combination of those - would indicate a respiratory infection.
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