I believe this is 3MB. If you are asking concerning the data logs, Pressure Pro have created a calculator you can find here: https://www.dropbox.com/s/45uf1p7mqer0mrq/DataLogCalculator.zip?dl=0. This will provide you with a rough estimate of how long the data log will take to fill. The more alarms you have, or the more missing sensors you have, the faster the data log will fill. Please keep in mind, though, that the data log will automatically roll off the oldest data in place of the newest.
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