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It will sync all the data since the last sync but it only has enough memory to store up to 7 days of detailed stats. If you go longer than that between syncs then it starts to hold data at a daily summary level and it can store up to 30 days of summary data.
So, it should ok on your return but the data may look a little strange depending on how long you are gone.
Will you be able to keep it charged while you are away?
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