Recently had 6 new laptops - all took 10 hours to download updates/reboot/download updates - on and on and on.Then came Office and AV updates.
My niece left her laptop doing an up date overnite, forgot to plug the mains bit in - laptop switched off and then refused to boot, hard drive trashed with boot problems, could not use recovery tools, had to do a rebuild - all her uni stuff saved though.