It depends on how full that area is. In my region, probably within a few days in Summer, less in Winter. Where I'm working lately in Columbus, OH, because of a local RSP snafu, orders are over a week behind in most cases. But we're working hard to get that caught up
Sometimes same day and next day, but that's rare to see.
The satellite providers are generally quick on installs, as they have done the research that the longer a customer waits the more likely they are not to get installed.