LOL, no but my back would hurt enough after about a half hour I would not be able to stand up straight anyway. I don't use the 310 over about a half hour at a time without a rest in between. I have already had three back operations over a six year period and the Dr. said he did not want to see me back cause the next time would not be as much fun. He told me to get a different occupation but I was not smart enough for that. That has been about ten years ago now and I have finally learned not to push it so hard.
My sons have the big dog saws (not sure if the biggest one is a 660 or an 880). At my age I don't want to work that hard. Come to think of it, I didn't want to work that hard when I was younger, but thought I needed to.
