I don't have the reference at hand at the moment but at work we have a microwave that has one wheel to select wattage and one wheel to select duration (30 secs increment).

This UX fits every frozen/industrial food because it corresponds to the manufacturer's cooking information (eg: 3minutes at 700watts, 5 minutes at 500watts, etc.).

At home I have a monster with two different alarm settings, not wattage bug a 10 grade scale, a keypad but the only way to set up time is through the plus and minus button, etc.