If you're a legend Braniac, 4 weeks may indeed be enough. But not for me.
Keep in mind that the fulltime Flight Planning course at Maroochydore is about 2 weeks long, with lots of homework each night, and many practise exams, using up most weekends. The instructor then recommends that you self-study for at least another two weeks, which includes a practise exam each day (which easily takes three hours each attempt).
It's very intensive, with speed and accuracy requiring priority
