Solo Rider, always DFL
Join Date: Jun 2006
Location: Beacon, NY
Bikes: Cannondale T800, Schwinn Voyageur
If you're not in a rush, it's not a big deal. I got a bit of a skin issue from my first metric, which was not related to exertion or saddle sores, just a coincidence.
Take your time, take a break now and again if you need to, and it shouldn't be too tough, if you have a decent number of miles in your legs this summer.
Hang on... just read your longest ride of the season was 21 miles. Given that fact, it might be a bit of a stretch. Fifty is going to be a big increase over 21, and the usual rule of thumb is that if you can do 80% of a distance on a normal ride, you can do the full 100% for the event day.
If you have means to bail out in the event that things don't go well, I'd say go for it. Otherwise, it might hurt a bit, but you'll probably be able to get done if you're sufficiently determined.