Question timer in reporter app or alternative?

I use the reporter app to have subjects answer questions about their current status during a work day. My biggest issue right now is that I can’t limit the window of random alerts to working hours. So people have to turn it of and on by way of the “Sleep/Awake” slider and that they will forget for sure, so they turn it off permanently. Anyway around that? Or do I have to turn to some other smartphone based questioner app?