Did 34.5 miles today, my longest ride I have taken since my heart went into permanent Atrial Fibrillation in September, 2004 - and I did fine. I am doing this at about 70% heart output, and I am pretty proud of myself.
Oh along the way, met my wife and took a two mile walk and had a Subway.
Oh, and I did this all in my tights only. In my rush to get off on the ride, I forgot to put on my bicycling shorts.
50-55F, significant head wind returning. About 5 total miles of gravel road and trail.