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What is about the longest you can leave it in one place without killing the grass?
Move it every chance you get- your birds and the lawn will do better. They will also eat their poo if left to sit on it.
I move mine as much as I can, which means at least twice daily. Your grass won't die unless you fail to move the tractor and it turns into a "poo cake." The grass will rebound quickly and BRIGHT green where the tractor was. Even with only 25 birds in a 10x10 tractor, you're going to want to...