In a post that discusses why some Windows devices aren’t getting the latest quality and feature updates, a Microsoft Program Manager clarifies the connected time requirement for an update to be successful.
The author of the post says that a minimum of two hours of continuous connectivity and six total hours of total connectivity is required for update completion. Microsoft urges device owners to leave devices powered on and connected so that updates will be successfully downloaded and installed.
More information may be found on the Windows IT Pro Blog.