Soft pen calligraphy is best several times a week.

Generally, it is good to do it once or twice a week/kloc-0, but you should practice it every day, and you can't waste it. Once you have no self-cultivation, you will not learn well. It can't be measured by time. It depends on the effect. I think you can concentrate for half an hour to an hour, mainly because what you write is like a copybook. It is a hard journey to reach the realm of calligraphy, and the so-called calligraphy is a lifelong practice. For friends who are interested in calligraphy, a lot of calligraphy practice is very necessary. However, for those who only take calligraphy as a way to cultivate their self-cultivation, there is no need to bear too much pressure on themselves. It is a very happy thing to write calligraphy, decorate our spare time and keep fit with pen and ink. But to achieve the standard of good handwriting, we must accumulate and practice regularly, preferably conditionally, and don't interrupt easily. Through long-term efforts and adaptation, it will definitely bring you surprises and rewards.