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https://www.tenforums.com/windows-10-news/104878-announcing-windows-10-insider-preview-fast-build-17107-feb-23-a.html

What’s new in Build 17107

Windows Update Improvements

Keeping PCs Up-to-date: ..
when Windows Update scans, downloads, and installs on a PC with AC power
– it will prevent the PC from going to sleep when it is not in active use,
for up to 2 hours when receiving an update in order to give
Windows Update more opportunity to succeed.