Apple Watch Series 6 Blood Oxygen App
How often should the Blood Oxygen App be checking my oxygen level? IOW, how frequently should I see data in the “Show All Data” display?
Apple Watch Series 6
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About background measurements
The Blood Oxygen app on your Apple Watch will occasionally measure your blood oxygen levels if background measurements are on. This will usually happen when you are not moving. Depending on how active you are, the number of readings collected each day and the time between these readings will vary. Blood oxygen measurements use a bright red light that shines against your wrist, so it may be more visible in dark environments. If you find the light distracting, you can turn off background measurements.
From this article:
How to use the Blood Oxygen app on Apple Watch - Apple Support