the values are output hourly and as such are reliable. But: since the individual values can fluctuate, only values averaged over longer periods of time are really reliable. This means:
1) The device only gives 24-hour "moving averages", which means that at least during the first 24 hours they can show a trend, i.e. they do not remain static.
2) But even these 24-hour averages should be followed over several days. Accordingly, the device gives the 48-hour mean value by default. This determines the "alarm level" of the device.
3) However, the manufacturer actually recommends an even longer calibration period, at least 7 days.
4) Professional providers typically require that measurement series last at least 3 months in order to be able to reliably measure the average load.
So, in a nutshell: you can see reliable values after a few hours, but to make more accurate statements you need to measure for days if not months. The radon concentration fluctuates too much for that, or the individual measurement is not reliable enough.
Does that help?
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