Unlike
@Ajax Bay I got 5 hours' sleep in total at LEL, less at PBP. But ... I rode through every night, napping a couple of times. I like night-riding
and south/west-bound it's easier as wind is lower.
The difference was I finished in 99 and 68 hours respectively, stopped briefly at controls (2-15 mins only), bought snacks and just kept pedalling.
However, I want to ride PBP as a Randonneur because I didn't actually see much of what was going on; villages came out to applaud the Vedettes as we came by, partied with the Randonneurs and were asleep when the Vedettes came back through.
@Ajax Bay 's spreadsheet above was invaluable on both for helping to work out what I could, and couldn't, achieve. In my case I was injured at LEL, with a partially-functioning right leg at the time (split IT band, torn tendons and minor internal bleed from a previous crash), and didn't know if it'd mean a dnf - hence the non-stop approach because when the leg stopped working that was ride over. It's now been mostly fixed so not as much of an issue.
Every rider is different, but being able to partly ride through the night makes the difference between being comfortably or just inside the time limit. Doing a 400k, or preferably a 600k or both, beforehand will help you work out how to manage this. Also, the equipment that may be fine at 200k may hurt at 300, be agonising at 400k and cause a dnf at 600; i.e. I use an MTB saddle on my audax bike which is totally different to my others just for comfort, the bike's set up for distance rather than speed, etc.