Only allow Windows 10 to automatically restart on sunday (after an update)

Concering Windows 10 Update automatically restarting the pc:
I only want the pc to restart on sundays, so setting active hours is not enough. An 'active days' option would be better.

There is equipment connected to multiple of our pc's which run tests and these tests can take anywhere between 10 and 35 hours. So Microsoft rebooting our pc's whenever it wants to screws up our work severly and is costing us time and money.  We can tolerate it restarting on sundays. I want to set this once and never have to look at it again, so rescheduling after each update would be a severe PITA and not a real solution. We just don't have the time to go around and check every pc if there is an update waiting.

Does anyone know of a registry setting or something which allows blocking automatic restarts on weekdays + saturday ? Or alternative : just block windows update completely on Windows 10?
BelgianITGuyAsked:
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McKnifeCommented:
Disable the windows update service:
sc config wuauserv start= disabled & net stop wuauserv
Enable it on sundays using  
sc config wuauserv start= auto & net start wuauserv
Have task scheduler launch a command line search and install updates and reboot (easiest way I know: wuinstall freeware:  https://web.archive.org/web/20151227002916/http://www.hs2n.at/component/docman/doc_download/11-wuinstall-11-32-bit )
wuinstall /install
shutdown -f -r -t 0
Disable it on mondays again using
sc config wuauserv start= disabled & net stop wuauserv
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Hello ThereSystem AdministratorCommented:
Maybe this fits you better:
Go to Settings -> Update and Security -> Advanced Options -> Notify to schedule restart -> Select the day...
https://www.howtogeek.com/221903/how-to-schedule-restarts-for-updates-in-windows-10/
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Hello ThereSystem AdministratorCommented:
Btw. I would not rely on disabling the service. I would do this:
1. Open Task Scheduler, search for Reboot task and disable it.
2. Then go to %windir%\System32\Tasks\Microsoft\Windows\UpdateOrchestrator and rename the Reboot file to Reboot.old.
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McKnifeCommented:
Please add why you would not rely on disabling the service. This is a solution for ages. As I let you and others know in the other windows update thread here, only inplace upgrades will re-enable it.
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Cliff GaliherCommented:
The only supported and scalable method to do this in windows 10 is to use WSUS and set deadlines instead of relying on windows update.
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