rock courses time length?

how long did it take for you to do the rock 1, 2, and 3 courses? i really wanna practice alot this summer, but would it take longer than 3 months or so?

You may not like this answer as it's very ambiguious, but... It's going to take as long as it takes. You don't want to blow through the material. You want to ensure that you are comfortable with each topic.

I made that mistake, then found myself going back and re-referencing old material. :)