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How do you configure a router to limit the time of an internet connection availability?
Routers have settings that will block certain URLs or websites based on certain keywords that you specify. You can specify specific URLs, specific domains or simply keywords that the router should block. If you specify the keyword ".com" for example, your router will block anything that has ".com" in its URL (which is a fairly big majority of websites).
Even the most basic routers also have settings for schedules. Below is a screenshot of a typical router with scheduler function. Note that you can specify which days the blocking will take effect as well as the time frame.
URL, domain, key word blocking when used in conjunction with the schedule function of your router will effectively limit internet access for devices that connect through your router.