that would probably be a VERY long day but eye-opening for sure. Plus you would get to be involved in something really amazing. I sometimes go back and watch the films I was involved in even though I cannot even spot myself in the scenes outside of one or two films.
Since you have your own company this would probably be something you wouldn't be able to do because the production companies really don't care if you have other obligations. They are not going to work around anyone's schedule. I think they kind of prey on the unemployed lol
RE: What's it like working on a film set? Working as a "stand in"