Did it, completed my first ever 50+ miler (55 miles, but who is counting). I did it solo and with some 20+mph gusts hitting me. Here it is on Strava:
I was tired, sore and had a headache afterwards, all kicking in about an hour after the ride. My guess is that I did not eat nor drink enough on the ride.
Hopefully next weekend I can do a metric or further, as well as on subsequent weekends leading up to my June 10th Tour de Cure century as a red rider!