Work day is over. You pack your things and you shut down your laptop. And then Windows update kicks in and tells you not to turn off your computer until it is done. Congratulations, you have just wasted a ten minutes waiting for computer.
This annoyance is usually avoided by putting your computer to sleep instead of shutting it down. But that option is not a valid one for those with dual boot. At one point or another you will have to go through shut down procedure.
If you have a laptop (or UPS) there is a trick that you can pull. Just unplug your laptop from power. Windows will detect that it is running on battery power and it will not apply updates during that shut down. You've got quick shut down and update will wait for whenever you actually want it.