Well Mike, 24mins would be a nice rounded figure of 25mph average speed !
what time should you do ? Hmmm well 28 mins or less is respectable i think.
As a point of reference Gail (who is a girl, all be it a fast one) has done the probus/ladock S6/10 10 mile TT course in 26 min 12secs this year. (don't know if thats a PB). So aim to beat that ?!
Last time i can rememeber doing the S6/10 course i did a 22min 33sec . But i was part of a 4up
I did do one 10 mile TT this year,the leedstown 10, and managed a 26 min 48sec.