Today was the first time Mushu was left alone for any real time. 3.5 hours this morning. When I got home, there was no problem, so we had lunch and I went back to work. Then I came home 4.5 hours later and I thought he would kill himself getting out of the crate. Still no mess in the crate. Based on today, it appears that Mushu has a 4.5 hour capacity at this time. Let's see how this bears up as we go forward.