Joxster
This is one thing I may be better than you at. When i went to Kirroughtree on my own, I managed to get lost. Maybe an hour in, you come down some singletrack onto a fireroad. The other side side of the fireroad you dip into some trees and the singletrack continues. But as it was on a junction with another fireroad, i went down the fireroad, then carried on into thick gorse and a hillock and then when I hit a farm wall with nowhere to go I decided I may have gone slightly awry. I was thinking that the singletrack wasnt well maintained and pretty hard at that point too [:-)]
However, I seem to get lost for no more than half to 3/4 of an hour at a time, so I am sure others have been lost for longer.
I got lost in the New Forest and ended up by Southampton docks 😕 The other one that springs to mind, I went out for a gentle warm up to get the legs going on the morning of a bigish event and ended up doing a five hour ride to get back to the start with about 15mins to spare.