 # How to calculate the average duration of a single day in the United States

A couple of years ago, the Economist ran a piece on the average length of the average day in California.

They used a simple formula to estimate how long a day would be for most people.

The equation was: [(x-1)/(y-1)] = (x-2)/( y-2) + (x+1)/(-1) = 2.5 years.

Since that formula was easy to calculate, the story went viral and the numbers have since grown.

But a new calculation is getting a lot of attention.

The Economist has published a new piece on their website that uses the new algorithm to calculate average daily durations in California, which is currently under siege from a drought.

The new article breaks down the formula as follows:  (x) = length of day at the start of the month (in seconds) (y) = total days in a month (e.g. 1-month month) (x + y) = time of day (in hours) (Y) = average duration (e-time) (1-year month) = current year’s average duration = average of current and previous years’ average durations = (1 – y)/(1-x)/(x+y)

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