Estimate how many hours you use (or will use) each device in an average day. For example, if you use a microwave for 3 minutes at a time, 8 times per day, then you would write 0.4 under "Hours per Day".​ And if you use your waffle iron once per week for an hour at a time, write 0.14 under "Hours per Day" for that item (1hr divided by 7 = 0.14).