If your router has a parental or device control feature then follow the below instructions to limit internet usage per device.   1. Log in to your router app or web interface.  2. Then go to advanced settings 3. After that open security Settings and enter parental control/device.   4. In the parental control, you will find all the devices connected to your router.  5. Select the devices you want to limit and then set internet access time limits or set up a usage limit. 6. If you want to block certain websites then place the URL and limit them too.