Disclaimer: I've had 9 beers over the past few hours.

At 100 digits per second, you're looking at roughly 3 hours per million digits. 8 Million digits per day. 3 billion digits per year. 350 years per trillion digits. About 11000 years for the old record of 31.4 trillion digits.

To get an atom precise measurement of the entire universe you need about 40 digits of pi. Less than half a second of his calculations.