It would be fantastic! I have three computers with my child's user account. I want him to use two hours at the most. With this limitation to make the configuration of time usage independent of the pc, it can only use a single machine. Windows 10 Microsoft Safekids allows you to choose whether you want time sharing between machines. At this point Microsoft came out ahead.
Another problem of the kasperky safekids is the obligation of choosing the time limitation with the scheduling, or one or the other. I can not set up to use 2 hours during the day, but only between the hours of 8am to 12am and 4pm and 6pm.
The request seems to me already done.