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Variation - Mechanical Experts Please Help!

Trying to understand Half-a-month-old SMP's moods:

Will gain about 5 seconds when worn for 15 hours;

Will only gain about 1 second when resting crown up for nine hours;

Does that mean it would gain 8 seconds if I wear it for 24 hours and that it would gain only 4 seconds if allowed to rest crown up for 24 hours?

8 seconds a day appears to be a bit much for a chronometer; how come such a big difference between rest and wear?

Thanks for your advice!

Claude