Congratulations!
35 minutes straight is no small accomplishment! I certainly couldn't do it right now.
If I'm on a treadmill I can really only run about 3 out of 10 minutes, and that's only because I run for two minutes, then for another minute at a different time!
However if I'm doing the running on my WiiFit, I can run for 15 minutes, maybe a little more. A lot of times that seems to come down to some fast marching, though, so that's probably why.