I would think 6'-7'. Type of soil you have will a determining factor because sand is easier to penetrate than most black soils
Ok that’s what I was wandering I went yesterday evening and looked at a disk and it measured 80” with 24 cutters that’s probably the one I’m going to end up getting it seemed to be in pretty good condition for a 30-40 year old diskI would think 6'-7'. Type of soil you have will a determining factor because sand is easier to penetrate than most black soils