Ten years as a painter, thirty years as a calligrapher and several years as a seal engraver.

Thirty years. From a popular saying: ten years painter, twenty years calligrapher, thirty years seal engraver, thirty years seal engraver. Seal cutting is the art of combining calligraphy (mainly seal script) with seal cutting (including chiseling and casting) to make seals, which is a unique art form of Chinese characters.