For me, about a hour and 2 (or 3?) reboots. And this is minor version update that consists only in bugfixes. I don't understand why overwritting few megabytes o

For me, about a hour and 2 (or 3?) reboots. And this is minor version update that consists only in bugfixes. I don't understand why overwritting few megabytes of files takes so long time and requires multiple reboots.