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PocketBook, Onyx Boox, and Bigme have the option to automatically turn off after 48 hours.
In any case, I believe that times of less than a day are more focused on daily reading, which varies greatly from one user to another. Perhaps it is considered unnecessary to have an e-reader turned on while you sleep because you are certainly not going to read during that time. I have the auto-off setting set to 4 hours (and sometimes I have had it set to less time).
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