Sorry for bumping an old topic, but this is the closest I could find to my own question. I have time restrictions set up for internet access as described in Scenario 1 here:

How to set Internet access time limits in pcWRT

If I want to allow Google Hangouts at times where internet access is otherwise restricted, so my son can contact his mum while we’re socially isolating but not use the internet for anything else at those times, do I just need to set up a calendar with hangouts.google.com and hangout.google.com under sites, or is there anything else I’ll need to add to sites to enable video calling at my chosen times?