It's all based on location, and local laws. What I can get away with is vastly different from what the yuppie in the development in town can get away with. Business types can vary as well. My uncles shop is located in a semi residential area, however local laws state he can do basically whatever so long as it's related to normal business. We've had some late nights working in customers equipment and vehicles, but have always tried to be mindful of the people that live in the area. Pissed neighbors arnt good for business, and even if you are in the right, the cops still come out and harass you if you're working too late. Just nice to be mindful.