Did you notice any warnings that there would be a reboot while you were setting up the file copy or defrag? How many hours, cumulative, had you spent in Windows

Did you notice any warnings that there would be a reboot while you were setting up the file copy or defrag? How many hours, cumulative, had you spent in Windows in the week leading up to this reboot? I think the answers will reveal that my point is being illuminated nicely, and I thank you in advance for the assistance in this matter.