Fortigate 7.6.1 policy with timer and passwort release

[swiss_daddy]

Hello all 

I'm a new fortigate user and have a Fortigate 40F at home.

How is it possible to create a Fortigate firewall policy that expires after a certain period of time?

I don't mean a policy with "Policy expiration - Expiration date"! 

I mean a policy where I can set that it can only be active for 1 hour during 24 hours and then resets itself the next day and again for 1 hour may be active.

Reason of the question:
I'm looking for a way to limit internet access for my teenagers to a certain time per day, so that they only have internet access for a total of, for example, 1 hour each day.  (not always same time every day - so a timer)

If I could then activate this policy rule with an admin account, that would be great.

Thank you for your help.

Greeting
Benjamin

[swiss_daddy]

Hello all

Well I have done a downgrad to 7.4.3 and with this I'm able to use Webfilter Quotas.
This exactly what I need.

Thank you all for your support! 

Regards
Benjamin