Allow internet for 1 hour or more

As a mom, I use the fingbox to restrict internet to my two sons. I don't want to have a schedule. But, I would like to be able to give them internet for a fixed amount of time when they finish homework, etc. Currently, I can turn off the internet for different amounts of time (1 hour, 2 hours). I would instead like to always have the internet off and then just turn it on for 1 hour or 2 hours.