How do people who insist on self-study for more than three hours every day do it?

It is actually easy for people who insist on teaching themselves for more than three hours every day, and you can do it in life. First of all, you need to mute or turn off your mobile phone, so that you won't be disturbed by some external things, and you can choose a direction you are interested in and study quietly. After a while, when you really devote yourself to one thing, you will find that time flies so fast that you will study for three or four hours before you know it.