I've been trying to remember if I've ever ridden 200 miles in a day, outside a formally sanctioned event. I've ridden to a friend's house in Mallaig from Leyland, and I once broke the journey at Moffat, so I might just have done 200 miles on the second day.
I find it easier to go a long way in a disciplined event. I've done 11 Audax SRs, so that's 22 occasions I've gone 200 miles in less than 24 hours, 300km rides don't count obviously. Then there are 4 PBPs, so 12 there, and 3 LELs , so another 12. Then there are a few 24 and 12 hour TTs. So over 50 days with over 200 miles ridden. I've done over 200 miles in 12 hours in 24s and 12s. I'd need to check my records to find out how many.
I doubt I'm very unusual on this forum for having done that number of Double Centuries. There are a few Quintuple Centuries in 24 hours around here. I was just musing why it is that this forum seems to be the centre for informed criticism about the Year.