Between now and December next year I'm going to do a series of permanents or self-regulated rides that would qualify for a Super Randonneur year, https://rusa.org/award_sr.html inc a Grand Randonnee 1200km also. To be mapped, ridden and time-stamped/proven in any way reasonable, it's just for my own reasons. The SR/SR - Self-Regulated Super-Randonneur.
The events—called brevets—are 200km (13.5 hour time cut-off ), 300km (20 hours), 400km (27 hours), 600km (40 hours), and 1000km (75 hours). Grand Randonnées are 1200km and riders must finish in 90 hours or less
All rides to be a fair test of what can be done in the time limits - ie hilly is better than flat and mixed-terrain is ideal. Randos are traditionally on-road but not always so some doubletrack or an off-road link trail at 3am is to be encouraged. The perfect SRSR ride might be one with a few unknown-condition sections, some byways or forest road and some hills, one where you scrape in within the time limit genuinely done for, knowing you gave it all. A personal test of route aesthetics and solo riding effort management is the only aim, knowing what you can do within a distance and a time and then pushing it a little.
I guess for many of us the 200km is easy enough. 300km is a long ride though and the others should make for some memorable from-the-door riding experiences.