That depends on what kind of work you want to fold. Generally simple works (such as Kawasaki Rose) can be 7 ~ 10 cm, and slightly more complicated works (such as the famous Komatsu) can be 15 ~ 20 cm. For more complicated works, such as Kamiya Satoshi's works and the most origami series, it is more than 40 ~ 80 cm. As for the most difficult ones. (All above are calculated according to the first attempt. )