CONGRATULATIONS!!!

I am sooo impressed. The jump in mileage is a huge accomplishment and you definitely deserve to be proud of yourself. It sounds like a fun ride, and you weren't even reaching your limit! Awesome!

4hours spinning. Ick :-)
I am a racer and ride all the time. In the winter in chicago, most of that riding is on a trainer in the basement of the LBS. Nonetheless, the longest indoor rides I ever do are just a little over 3hrs. And by the end of some of those "rides" I was very close to tears from the pain/suffering. I can't even imagine the mental (and physical) toughness it takes to survive 4hrs indoors!

You go girl!!!!!