Finally did a 4-hour ride after cutting short my last 3 or 4 attempts. I did it by riding to a 2-hour+ club ride that was about an hour ride from my house so the only way to get home was to ride

.
About an hour into the club ride, I had the weirdest mechanical issue. The bolt holding the guide pulley in the rear derailer had come loose and the chain no longer wrapped around that pulley and became very slack. Luckily no parts were lost and I was able to reassemble everything and complete the ride.
I passed these swans as I left for home from the park where the club ride started/ended. As I pulled up to them, they were napping and had their bills tucked in their wings. But me stopping for a snap woke them up.