50-degree temperature is 0 minutes to heat = 50/0 = 50
60-degree temp. is 1 minute to heat = 60/1 = 60
70-degree temp, is 2 minutes to heat = 70/2 = 35
80-degree temp. is 3 minutes to heat = 80/3 = 26 2/3
90-degree temp. is 4 minutes to heat = 90/4 = 22.5
100 degree temp. is 5 minutes to heat = 100/5 = 20
Hope this Helps :)