When is it generally better to practice yoga, and how long is it appropriate to practice yoga at a time? Should the breathing time in yoga books be strictly observed?

Yoga advocates obeying the laws of nature, doing it at sunrise and resting at sunset. In other words, it is better to practice when the sun just rises in the morning and when the sun is ready to go down (on an empty stomach). Traditionally, the sun comes out in the morning, and at sunset, Japanese worship is done first, then other postures are done, and finally meditation exercises are done. Practice time should be based on your own situation. If you don't have time, a few minutes will do. For example, doing handstands for three minutes every day can have a better fitness effect. If you have time, practice as much as possible. Master Iyengar practices more than 10 hour every day. In particular, it is best to sit for a long time, generally more than 40 minutes at a time, and sitting for more than 4 hours is really kung fu. If you can't breathe well in asana practice, you should mainly do deep, long and even breathing. The real breathing skill is meditation, such as slow fire yoga.