Finished it yesterday. I was either the 7th or 8th woman to hit the magic 500. I did a 240km DIY Audax on 24th (left at 3am!). Xmas day I was trying a 180km DIY, but in the end my poor eating the day before left me doing the ride basically on empty. 14.5 hours to do 180km, my first DIY DNF/DNV. Then Yesterday I did a short ~20km to a train station, then skipped ahead a bit, before doing the final 57km. I ended up doing a bit of a dog leg and then a lap of the block to make the 57km needed to make the magic 500km.
It was a bit of a mixed bag, Xmas day was mostly type 3 fun, a little type 2, and the tiniest sprinkle of type 1. Xmas Eve was mostly type 1, and then boxing day was a slog, with added puncture, random unexpected off road, and rain.
500km in 3 days is still the most I've done in such a short time, even if It was pretty damn slow. Respect for anyone even trying this was harder than I expected.
J