Is the calligraphy practice in East China effective?

My child is studying calligraphy in Wenzhou Huadong in the fifth grade. The effect is good, and the children are very interested. Now I have changed from hard pen to brush pen, and I am ready to study for a long time. However, children will be a little tired, and practicing calligraphy is a long process. I'm going to cancel my children's piano training! After all, I am still studying, so it is better to arrange my time reasonably!