I am teaching my thirteen-year-old nephew programming. We use Python to nail the basics of variables, conditions, loops, branching, functions, classes, etc. And Unity and C# to make games and learn some physics, vector math and matrices.

The length of our sessions is two hours. The beginning of a session always starts with a recap of the previous. Asking some questions to make sure he has the correct understanding.

He always types in everything. I never touch the keyboard/mouse.