Email warnings come 12 hours later

We've installed Norton Family on my sons PC because we have an issue where he should be doing homework but gets distracted.

I've got several websites that are the common culprit added to the "Allow but warn" list.

The emails, however, don't come in until about 12 hours later which is useless to me.

Any way to fix this?

 

It's a Windows 10 Professional version, using Chrome. The extension is installed and active, and working. Just the notifications are delayed.