The most important thing to learn calligraphy is to use your heart. Even if you only practice for five minutes today, but you understand, digest, absorb and then use words and change the old writing habits, then such practice is effective.
On the other hand, if you just practice and don't think hard, and after practice, how to write is still the same, then such practice is invalid.
Therefore, practicing calligraphy must focus on quality, not time, especially for adults with better understanding. Mr. Qi Gong said that calligraphy is not acrobatics and does not need to be young.
So the length of practice varies from person to person, two hours, to be honest, it's very tiring, but if you really like it, you can stick to it for one day.
Therefore, the principle is to have quality and not be tired.
Therefore, I think the study of calligraphy is a long-term process. Keep enthusiasm, insist on quality practice, practice with words, and you will get something if you are fascinated. If you are satisfied, please adopt it.