Just got back from a record attempt on the North to South Wales bikepacking route "The Cambrian Trail".
Only just made it in the end, but I broke the record by something like 25 minutes (2 days, 14 hours, 50 minutes). Conditions were utterly horrific at times, and I genuinely thought I was going to freeze to death on the second day as I couldn't find shelter. As usual I didn't sleep, so the whole three days only saw me lay down for a few hours to recover my muscles a bit (I really need to learn how to sleep outdoors). Blew my hamstring in the last four hours and by the time I finished I couldn't even cycle back to Swansea for food / a train. I had to sit there huddled into a shop front in some random town at 3am, waiting for my missus to pick me up.
You can find my numbers / details here:
https://www.strava.com/activities/987346510
https://www.strava.com/activities/987346583
https://www.strava.com/activities/987346728
Route details here:
https://cambriantrail.wordpress.com/
Total Distance: 513 km (318 miles)
Total Ascent: 14,400 metres (47,100 feet)
Difficulty: Very hard, with sustained and challenging climbs, some hike-a-bike in parts, exposed tracks, sparse resupply at times.
Total time in the saddle over the 3 days was about 41 hours.