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16 minutes.
The watch would gain 24 minutes in 3 days
Charges for power are mentioned in kilowatt hours. You need to know how much you are being charged for kWhr. 12kW hrs every day it comes on
The simple way to calculate cost is $1 per watt per year. This is based on a cost of about 11 cents per kilowatt hour. Your cost may vary. So, 60 watts times 1/2 year (12 hours /day) divided by 12 ( 1 month) equals $2.50 per month.
Cost = 15 + 5h