Doubling time equals 21 Days

Thursday, January 01, 2015          1,000,000
Thursday, January 22, 2015          2,000,000
Thursday, February 12, 2015          4,000,000
Thursday, March 05, 2015          8,000,000
Thursday, March 26, 2015        16,000,000
Thursday, April 16, 2015        32,000,000
Thursday, May 07, 2015                64,000,000
Thursday, May 28, 2015              128,000,000
Thursday, June 18, 2015              256,000,000
Thursday, July 09, 2015              512,000,000
Thursday, July 30, 2015           1,024,000,000
Thursday, August 20, 2015   2,048,000,000
Thursday, September 10, 2015 4,096,000,000
Thursday, October 01, 2015   8,192,000,000