How to configure a wifi moden to time out during a set interval

Nirmalanand Posts 1 Registration date Friday January 6, 2017 Status Member Last seen January 6, 2017 - Jan 6, 2017 at 11:36 PM
I am planning to give Free Wifi access to my clients to use it for business purposes while at my place ( and not for "comfort surfing"- that's why plan to set access for a limited time).
I would like them to access my wifi for a period of 45 minutes every day once they access it on their phone/devices. It should time them out after 45 minutes of use every time once they access, but i am not sure how to set it up.
I have already installed a wifi modem and access, but waiting for some help as to how to provide this timed access.
Please help.