250km to Hull
Half of a 500k ride (eg, Festive500!) Mid-winter speed around 17mph = around 18hrs of riding for the full 500k. 19hrs including stops. With only 8 hrs of daylight, I'll be riding eleven hours of darkness; eg, set off at 4AM, ride for 4 hrs in the dark, finish at 11PM after another 7 hrs of darkness. Ho ho ho!
Source of this route: https://www.strava.com/routes/2750722619277590684250km long 1189m of climbing 14.3mph in 10hrs51