Hi Chas58,
I did this on the one year anniversary of my finishing chemotherapy using a 48 / 16. 299 laps on a 125m track, which came to 23 and a quarter or so. I really wanted 301, but I'll take this all things considered for me. The AMB data was really interesting:
Lap Tm (sec)Mean12.027Std Dev0.368Min10.312Max12.82
Easily the coolest (and most painful) ride I've ever done. I have some video of it. Did not use anything aero, prepped by doing 3x15, then 4x 15, then 3x20 intervals. I'll do it again next anniversary.