What is the fine-grained topic of the following text: But there is one thing you mentioned that's awfully difficult to overcome, and that is planing over a large wide surface (because smoothing a table top wouldn't actually involve many sharpening cycles - my ash bench top required 1...one...uno (with a horrid stanley 70s iron)...anyway, the real issue here is that planing a large wide and long surface can be quite painful. Only return the topic.
Challenges of planing large surfaces