What is Estimated Time?
Estimated Time shows a prediction of how long it would take you to ride a given route. This number is based on your recent riding history, and represents an estimate of moving time. Each time you upload a new ride, your Estimated Time profile will adjust to reflect your most recent riding. Only rides exceeding 10 miles (16 km) will affect these estimates.
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Why does it think the ride started below sea level?
Because an altimeter based on air pressure can measure relative altitude, but not absolute altitude. So if it doesn't know the altitude at the starting point, everything with be off by that amount. My phone has an altimeter. Huh, who knew? You can correct it by hitting "replace elevation data" (but it doesn't know when you go over bridges).