From that exact same page, and as quoted by JSWolf already;
Quote:
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All-day battery life is based on 18 hours with the following use: 90 time checks, 90 notifications, 45 minutes of app use, and a 30-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours.
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It looks like they get up to 6.5 hours music playback if absolutely nothing else is done with the watch - is that likely in a real world scenario?