How big is the appropriate size to write "Three Graves"?

Height 215 cm, width 93 cm. According to the calligraphy Yiwang query, "The Story of Three Tombs" was written by Li Jiqing of the Tang Dynasty and written by Li Yangbing. It tells the story of Li Jiqing relocating and burying his three brothers. It was established in the second year of Dali of Tang Dynasty. The text is engraved on both sides, seal script, 24 lines, 20 characters per line. The original stone was lost long ago and was re-engraved in the Song Dynasty.