Finally, from the point of view of fitness, I have heard that 20 minutes of training can reach 1 hour of training, which can be done, but the premise is: aerobic training, sports foundation and correct movements. Or for athletes or people with many years of sports experience. Under the condition of ensuring correct and safe movements, you can do efficient training movements in a short time. In these 20 minutes, you will have a good experience of perseverance.
So for strength, muscle building and dimensional training, you need time to fully recover your muscles before the next training. So how many times can you do it in 20 minutes? It varies from person to person, obviously it is impossible to gain a lot of muscle through EMS fitness, but it is quite effective for you. So the last 20 hours can't reach 6 hours of training.
But it is not without it. It is a short-term, efficient and high-intensity training, which can be understood as HIIT, but it cannot replace any kind of training. It's just another way of training. When you are familiar with the exercise method and have not improved well, change to a stimulating method to make your training more effective and more yuan.