What about 15 days tracks? There are thousands of tracks in the archives.
I wasn't around for the
original discussion, so here are my 2¢: While
two week gaps without replays are annoying, I am not confident that the shorter deadlines would meaningfully increase activity. My forecast is that some races would be great while others would be very poor, with the number of pipsqueaks in the single digits. Then again, I have no crystal ball, and the only way of finding out what would happen is trying it.
(A weird idea, maybe too complicated to work well: what about having both long and short races - say, eight month-long races and eight 14-day races? Points could be weighed with a bit of coding, and the calendar could be adjusted to fit the seasonal activity patterns.)