Please check the website https://appodoc.com for a great overview.
This app allows you to set a timetable and a maximum duration the kid is allowed to play on a Windows PC for each day of the week.
A free server SW (see link below) on the gaming PC measures gaming time and stops games.
That means even if gaming time has elapsed the PC may be used for office tasks or other tools.
Agree gaming times with your kid and use this app to realize them.