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Now there's a thread derail if there ever was one. Depending on what kind of batons you're talking of course
But to answer your question I'd imagine supports on each side + a long support along the back of the desk top should work. You might need something at the front as well depending on the thickness of the desk. We use an 18mm birch ply top and it sags a tiny bit between two supports that are 140cm from each other
Office room at my house is 1.8m wide. If I was to put some batons onto the wall to make a desk the width of the room how would I stop it sagging? What top would I have to use?