I missed this one.
I found it on my first-gen Oasis. While reading a book, tap the top of the screen, then Aa, then Reading Settings, and turn on Show Clock While Reading.
Thanks, all, this saves me turning my wrist and moving my eyes to find out what time it is!
Actually, with nighttime insomnia, this could be a nice feature to increase your terror at how much sleep you are losing...
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