Have a look at these click here
There is (apparently) no maximum or minimum shut-down time quoted by MS and much depends on your system.
Mine takes about 20 seconds generally, but has been known to take longer.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
How VR is being used to simulate space
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.