Microwaving Fractions

I know that I eat too many microwave meals when all I want to do is comment on the packaging and the directions. The cooking instructions tell you to cook the meal for 3 1/2 minutes, but no microwave has a 1/2 minute button. All microwave timers are in seconds. Shouldn’t the packaging match the appliance and say cook for 3:30, since that’s what numbers you push?