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September 18, 2020. That's when Apple released their Watch Series 6, which has an always on color display, and enough battery to last all day.

• fsflover 5mo ago
  You can also configure PimeTime to have an always-on display, and it should even last more than a day.
• Zopieux 5mo ago
  >last all day Is this really the benchmark for a wearable's battery life? A single day?