I follow "20 + 20 + break" approach. My father used it for 30+ years (professor of physics and CS).
It means 20 minutes of theory, 20 minutes of practice, 10-minute break. It can be 25 + 25 + 5, or something along these lines. I never do more than 25. The bottom line is that people are getting bored after more than 20 minutes of theory.
It means 20 minutes of theory, 20 minutes of practice, 10-minute break. It can be 25 + 25 + 5, or something along these lines. I never do more than 25. The bottom line is that people are getting bored after more than 20 minutes of theory.
Good luck!