I am registered to ride London Edinburgh London. It is a 1520 KM ride along the coast of the United Kingdom and we have 125 hours to finish it. To put it another way, we'll be riding 944.48 miles in 5.2 days - that's about 185 miles a day.
LEL will be the longest event I've taken on to date. It's about 300K longer than Paris Brest Paris. The weather is infamous for rain and wind. The terrain is noted for its climbing. The distance is more than I typically ride in a month. To put it another way, this will be a challenge.