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Most trackers store up to 7 days of detailed minute-by-minute data. If you have a Fitbit Alta™, your minute-to-minute data is stored for up to 5 days. If you wait longer than 7 days (5 days for Alta) before syncing, you may only see the most recent week's detailed data.
Summary data (calories, distance, steps, and floors) will be stored for 30 days. If your tracker measures heart rate, summary heart rate data will be stored as well.
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Thanks for reply...spent two months in Florida, logged 20,000 steps per day including 35,000 one day day...couldn't sync as I forgot the gizmo that plugs in to my laptop..Was hoping to find the mileage when I go back... Sent from my Samsung Galaxy , an AT&T LTE smartphone