Many moons ago I did an offroad ride that should have been 80 miles and taken 10 hours. Then it rained and a strong headwind came up so we revised the time to take an extra hour- Then my co-rider- that knew the route inside out admitted that he did not know where we were- out came the maps and without a street sign or village name (Not many of those in the middle of nowhere up on the hills) to get our bearings---we were lost. That 80 mile ride finished up being 115 miles took 15 hours and the last half hour were very difficult in the ever decreasing light- Got to the finish- just as we decided that it would be safer to walk than ride. By the way- it is worse when you are soaking wet, and due to slowing down in the bad light, you are shivering and just on the point of hypothermia.