3/4 acre LB3210 w/one battery. It is programmed to run 1pm-midnight every day. We don't time it, but since our lawn is big and it stays mowed, it is running long enough... Note, our grass is very sparse, so it is easier for Lawnbott from a run time perspective. The many trees and odd shape makes it less efficient, but it still manages to keep up. You can see part of our lawn on the video posted on our site.