I went out and rode yesterday with my father in law, we did 24 miles (didn't even plan on doing 15)
Admittedly, we did stop at mile 8 for a 10 minute swim in Lake Ontario, that was icing on the cake.

It was much flatter terrain than I normally ride but I was really pleased about how I felt & the pace I was able to maintain. I was a little concerned that it would be too uncomfortable. I'm going to try to ride tonight and tomorrow just in case the other Dr. tells me I can't after my appointment Tuesday