uchristensen: Apparently I had the script fail in one tab (as in not receiving new updates to lengthen/decrease time), and it shows the familiar "The promo has ended". Having saved the AJAX output from the latest promo years, I looked and the message is different from the rest, which say: "Next offer starts soon (no need to refresh)". It is thus safe to assume that there is nothing more.
Therefore I bid you goodnight as I try to record the end time for the sale. Hopefully the last one sticks so I can just pull the final Unix timestand from there.
My Google Docs spreadsheet has been modified to include a separate sheet for statistical information. Hopefully you found it useful.
Link:
http://goo.gl/ATYL9R nice work, pretty interesting. thanks
also thanks to the OP and time keepers.