Puzzle for December 22, 2008

Yesterday was the Solstice marking the longest night of the year. The next Solstice, on June 20th, marks the shortest night of the year.

Yesterday the sun set at 4:41pm and rose this morning at 7:15 here in Colorado. On June 21st the sun set at 8:28 and rose the next morning at 5:34.

If each day's amount of sunlight gets longer by the same amount. How much longer is each day?