I set Minutes to prepare to 45 but the app shows 30. Why?

Some apps clamp the prepare time to their own limits, and that is their choice rather than a fault. We send the number you set, anywhere from 1 to 180 minutes, and the app decides what it will accept. What the apps said on the Delivery apps page shows what we sent. If an app keeps clamping, set the number the app allows so your kitchen and the app agree. The Orders from delivery apps tab in the docs covers Minutes to prepare.