Flexible QR code reset

I think it's more convenient to manager and scholars if we have a flexible QR code reset 1 week, 2 weeks, 3weeks, 1months, 2months, 3months, never reset and reset now. Managers don't need to reset QR code every 3 Days if they knew personally their scholars. It's a big hassle to reset every 3 Days specially if you have a big number of scholars and it just making login problems.