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I've recorded a 3km ride to Sainsburys at 20kph which my Garmin has advised warrants a 17 hour recovery period.
Some of that might be based on the HRV being measured and it picking up a precursor to illness. The device assumes that it may not be worn/used for every activity, so it tries to infer your physical state from the little data it sees.
If no HRM being worn then it's just random Garmin bollocks.
The calorie counting and recovery advice on Garmins is ridiculous.
I've recorded a 3km ride to Sainsburys at 20kph which my Garmin has advised warrants a 17 hour recovery period.