I have been testing Windows 10 parental controls and they simply don’t work. Many others have this experience.
They simply do not reliably impose screen time limits and in some cases do not even successfully filter porn. A limitation (not a bug) is that filtering only works with IE and Edge so you must prevent your child installing Firefox or Chrome.
Although it is necessary to set up Microsoft Family and add your children to it I advise that you do not use Parental Controls but invest in an alternative solution.
— update 2016/10/27 —
I found on one machine the Settings said that “cannot connect to Microsoft Family”. It seems that it fails dangerous and just lets the child login with no controls. It is possible that this was the root cause of the lack of screen time controls.
Dr James Bayley 
Actually, Family Safety was great under Win 8.1, but Windows 10 has taken away much of the functionality.
Most notably missing is the ability to create a whitelist of the only websites that you want your kids to have access to…
The other idea is to use a special parental control program. There are loads of them in the net, so you are free to chose, depending on the age of a child or on the seriousness of control, eg KidsWatch or Time Boss Pro…
Additionally you get remote access to kids PC, forced breaks, limitation internet sites by time and others
The other idea is to use a special parental control program :).
If your child has admin rights on PC…
There are loads of them in the net, so you are free to chose, depending on the age of a child or on the seriousness of control, eg K9 or Time Boss Pro …
Additionally you give remote access to kids PC, forced breaks, limitation internet sites by time and others