Damn, that's an impressive rate, and all high quality posts too. My merely middling posts have perhaps just been overtaken by him, given he's posting at an average of 3.136 posts a day (according to python's datetime module and division), while I've only made 2.679 posts a day.
Run an interactive python session (just type python) then import datetime and type 'postcount/(datetime.date.today()-datetime.date(y, m ,d)).days' (without the quotes) - replacing postcount and y,m,d with the appropriate numbers (and noting not to put the preceding 0's on months preceding november, which caught me out with an unhelpful syntax error, presumably because preceding zeros are normally used to indicate a base such as 0b for binary and 0x for hex)