Time Control - 1hr/day minimum amount too long

I purchased Norton Family parental control to substitute Screen Time Parental Control. My kids are still young (5 and 3) so they use restricted Android accounts where only a few apps are disabled; what I really need is a timer, which controls for how long they use the devices, without my starting/stopping a timer or trying to guess.

Norton Family only allows to choose in 1hr intervals, i.e. the minimum daily period is 1hr (and it goes up to 23hr!). It might help parents of younger children if it were possible to choose in 10min intervals. Can you introduce this change at the next update?