How long does it usually take to practice calligraphy with speed? Tell me about used ones.

Beginners practice from the beginning of the basic regular script, 20-30 minutes a day, 1 week, and adults need to extend it by 3-5 days. When the radical was written, they began to practice the whole font of regular script. The key is to persist. You can't just practice with "quick training", you should use your brain to concentrate. Practice when you are free. I practiced 10 days, and now my handwriting is much better than before.