How can I practice a good hand? How long does it usually last?

Hard pen or brush? Hard pen, if it is suggested that Pang Zhonghua practice regular script, Ma Zhao Guang can practice cursive script. But be single-minded and practice your style. Brush regular script can be Yan Zhenqing and Liu Gongquan in Tang Dynasty. The cursive script can be Mi Fei and Wang Xizhi. It is very important to practice calligraphy without asking for more. After getting familiar with calligraphy, you should be able to recite it. Once you have mastered some basic vocabulary, you can draw inferences from others. Wish you success!