I have an opportunity to do an 8 hour ride from Philadelphia to Sea Isle City. The ride is 97% flat. My bike is ready to go. I know all about safety, maintenance, what to pack, etc.
However, the farthest I've biked in the past year is 50 miles. The farthest I've biked in the past 6 months is 20.
Assuming I'm a 25 year old, relatively fit, determined, and have no medical conditions, would it be stupid to go on this ride in 4 weeks, with minimal training?