Emailed tweedlove and the response was this:
“Looking at last years lap times we’ve found that 45 minutes should be adequate to get around the course. That said, we will be monitoring timings on the day, and we will have the possibility to adjust this if we find the set time to be too short for the average rider.”
Which is strange as I took a quick glance down last year’s results and if you take lap 6 times there are about 25 under 45mins (out of about 350 entrants though some didn’t do 6 laps but only 1 of those had a sub 45min 5th lap)
Will see what happens on the day. If you all go slower it might move the cutoff time out a bit which would be a big help thanks 😉