I've not got past five yet & that beast was a 40" diameter. It's more about grain than size though. I just take a chainsaw to crowns although my splitter does split them okayAn old ganger said I should never need more than three wedges. He then demonstrated on a big stick of chestnut and it took three just to get the first one out. We were using the magnesium wedges from the saw kit as well as all the iron ones before we’d finished.