@casino Thanks for the suggestion. We won’t be able to implement this in the short term. In the meanwhile, you may try some workarounds.
For example, if it is possible to schedule a one hour window for some sites, create a calendar with a one hour window. The child will only be able to access those sites within the scheduled window.
If on-demand access is desired, you may create a calendar with no allowed time slots. So normally, the child won’t be able to access the sites. When access is requested, you can use the Calendar time extension function to temporarily allow access for the desired amount of time.