I am using a PicoLog 1012 with PicoLog R 5.20.9.

With a Sample interval of 5 minutes, as many samples as possible & 288 samples this should be a total period of 24 hours, this run actually completes in 22 Hrs 54 minutes. A sample interval of 1 second, as many samples as possible & 3600 samples completes in 58 mins 25 secs. A sample interval of 1 second, single sample & 3600 samples completed in 1 Hr 6 mins.

Can you throw any light on where the timing innacuracy could be comming from & how it can be improved.