How long can I leave my controller before downloading the stored data.

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Roughly speaking, if the controller is used for one VLF receiver and the rate is one sample every 5 seconds, a block will be filled in 120 * 5s = 600s = 10 mins.

The controller can hold 4076 blocks, so it should run for about 28 days. The magnetometer has two channels so will run for 14 days at the 5s rate, the 4 channel logger 7 days and the 8 channel logger, three and a bit days.