This has been done but only maybe once (not true any more) by Pete Simpson in 1991 in a time of 23:48. A challenge there if there ever was one? We now have a time set by Stuart Walker of 23:42 on 26/27 May 2016. Apparently Pete Simpson accidentally (!) added Flask Edge trig; Stuart avoided Flask Edge but added the Ox Stones, so still did 26 trigs.