errr... just been looking at the times for the North Downs 100... 16, 17 hours definitely out of the question methinks. 24 suddenly seems more realistic.
NDW100 is very hilly, TP100 flat, so there's no comparison. fwiw, my mara time is pretty much the same as yours, and I'm thinking of doing the TP with a target time of probably 18.30.
NDW100 is very hilly, TP100 flat, so there's no comparison. fwiw, my mara time is pretty much the same as yours, and I'm thinking of doing the TP with a target time of probably 18.30.