Question about Voltcraft Temperatur-Datenlogger, Luftfe

The logger has 2x20,000 memory locations (1 temp. 1x humidity). If you save a measurement every hour, that's 20,000 hours = 833 days. However, the battery only lasts for approx. 1 year, data is still saved!
If you save for 15 minutes, there are still 208 days! Everything clear?

As long as the battery supplies power. Or a matter of setting.

I don't know the exact length of time, but several weeks.
The settings on this device are impractical, and I wouldn't buy it again.

I measured for about a month. But I gave the data logger away because the software only runs on Windows and is very user-unfriendly. There are now better devices, also for Mac, e.g. from Eve.