Hah. It's a common trait among mathematicians. I had a stab at an answer myself[0], and gave a ballpark answer (once every 1.62 years). [0] http://math.stackex

Hah. It's a common trait among mathematicians. I had a stab at an answer myself[0], and gave a ballpark answer (once every 1.62 years). [0] http://math.stackexchange.com/a/387581/4873 http://math.stackexchange.com/a/387581/4873