About 2 acres. Right now there is a Husqvarna 315 and 415x doing the big open spaces. I have the i110n doing all the small/random/scattered areas that are hard or impossible to do with a wire.

That said I think the whole job could be done with one single RTK mower that is rated for a bigger space, but that wasn't availa available at the time and I've been evolving the setup over the years.