Both the number of decimal places and the time taken to calculate are records for the duo that have worked on the project. The fact that the transcendental number Pi has been calculated to 5 trillion places is amazing, and further proof that the figure is transcendental and not a repeating decimal – at least over the first 5 trillion places, that is.
"Alexander J. Yee & Shigeru Kondo claim to have calculated the number pi to 5 trillion places, on a single desktop and in record time. The main computation took 90 days on Shigeru Kondo’s desktop. Verification was done using two separate computers. The program that was used for the main computation is y-cruncher v0.5.4.9138 Alpha."
Looks like the chart of computer-era approximations of Pi here might need an update.
Ninety days is not long in the sands of time, but it is a very long time for a computer to work on a single calculation.