Congrats!
Just last Sunday (not this past Sunday...) my wife and I did our first 30 mile ride...ON MOUNTAIN BIKES! :eek: We rode the C&O Canal, so it was all level terrain, so there were no breaks from pedaling; it was constant.
We've done 15 miles before, and 20 on the road, so we figured it wouldn't be that big of a deal. While the weather was warm, it wasn't unbearable. The previous night we had done 15 miles, and from the start on Sunday, my knee was a little bit sore. It was a lot sorer after that 30 mile ride! Besides my knee hurting and our asses hurting from sitting on the saddle for so long, the ride went well. We weren't really tired, just sore.
Anyway, congrats on the 40 miles! I don't care what anyone says, 40 miles is a long trip on a bike!