The router interface should have that option, and the schedule it will run on i.e. Sunday-Monday. It can also restrict bandwidth used in a month, so you can limit them to say, 5 gigs or whatever.
My old Linksys router had that feature, but for the life of me I cannot find it on my new Netgear router. I can shut everyone off, but I want the flexibility to shut off kids (internet time out) while allowing mom and dad access.
It's odd the it's not in the Netgear Genie interface. I can't imagine why. Is the FW up to date?