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I have left Kobo ereaders in sleep for several months and the battery has had enough charge to wake up. Comparing a Clara HD and a PW 10th Gen, the standby time on both seems to be close to equal. Those two are the units that I use rarely enough that they spend most of their times sleeping. For either of them, the drain seems to be less than 1% per day.
One thing to remember is that Kobo and Kindle both use multiple CPUs in their ereader models and those CPUs can and do vary widely in their power management. For instance, the AllWinner B-300 Quad core CPU used in the Sage and original Elipsa has a well deserved bad reputation for power management (the main reason the Sage has such aggressive power management) while the MediaTek MTK 8113x CPU used in the Elipsa 2E, the Libra Colour, Clara Colour and Clara BW have a much better reputation for power management.
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