http://threeacts.mrmeyer.com/25billionapps/

I had to try to figure out when the 25 billionth app was going to be downloaded. First I figured out how many apps were being downloaded a second which was around 570 a second which equaled  around 34,200 a minute. Then i took how many there where at 6:30 which was around 24,658,610,221 then subtracted that from 25 billion. It gave me 341,389,879 left out of the 25 billion. If you divide that by 34,200 which is the amount of downloads per minute I got 9982 minutes left. That divided by 60 equals 166 hours left. If you divided that number by 24 it gives you 6.9 days. If you take 6.9 days and added it February 24 at 6:30 it would come around March 2nd since that year was a leap year at around 4:30 p.m. I would start downloading at around 4;00 p.m. due to the increase in downloads as it got closer.