We would love to have custom Nag Times. However, iOS only allows notifications to repeat once every second, minute, hour, day, month, or year. As bad as one minute and one hour nags are, all the others are worse.
This can happen if you get a new phone or have to restore your software. In the preferences, just below the "Remove Ads" button, there is another button labeled "I already paid! Remove Ads again". Tap that button and it should restore your purchase.
We love new feature ideas. Send you idea to firstname.lastname@example.org and we will try to figure out if we can.