Gordon Linoff wrote a bit about his habits here[0] but I still can't fathom how he manages to maintain such a rate. Imagine just taking a day or two off – you would then have to write 45 (or 68 answers) the following day. So assuming that he does take a day off every once in a while, this means on non-vacation days his average is even higher.
[0] https://blog.data-miners.com/2014/08/an-achievement-on-stack... (I'm gettting an EOF / Connection Closed error in both FF and Chrome but the Internet Archive has it cached.)