Research shows Windows updates can take eight hours to complete
Windows devices that aren’t connected to the Internet for up to eight hours at a time are "very unlikely" to successfully update fully and properly, a recent Microsoft investigation revealed.
Microsoft program manager David Guyer wrote in a recent blog post that devices need a minimum of two continuous connected hours, and six total connected hours to install “quality and feature updates.”
“This allows for a successful download and background installations that are able to restart or resume once a device is active and connected,” Guyer wrote.