300k a day for 4 days allowing 18 hours (<17kph) and taking 6 hours stop each night (4) gives the rider 250k to finish off in 19 hours say, with more than an hour to spare. So I recommend a rider do a 600 to confirm (to themselves) that they can do back to back 300s and at what speed. My experience was doing the BCM (600) in 36 hours: Day 1 at 22kph and Day 2 at 19kph with a 7 hour stop and 5 1/2 hours sleep. On LEL Day 1 310 @ 23kph, Day 2 320 @ 19kph, Day 3 260 @ 17kph, Day 4 290 @ 17kph and finished off with 270 @ 16kph (NB wind) with 4 'sleep' stops of an average of 7 hours (arrive to leave timings). Six hours with lights on. 3% rain (as in 'jacket on'). Lots of fun and great memories. LEL makes a point of not requiring 'qualification rides' (connect @PpPete 's PBP thread) but any sensible rider aspiring to ride LEL would be wise to do some 'normal' audaxes first: in fact perhaps an SR in the months running up to LEL. Proves the bike; proves and hardens the contact points: tests the sleeping routine / deprivation effects; gets loads of great miles in the legs; positions the mind.