ORN: No idea.
It's hard to explain. We were doing some demonstration running this morning and were out for several hours. It's not that I ever ran that long, but I did run a bunch.
Also, there's been a lot of "spam" replies to the blog. There's a setting where you have to type in a "hidden" word before you can post a comment. I'm sorry for the added step, but I think it's best for everyone.
Thanks for understanding.