BUT I will say that this is a guide only – like any ‘hours’ rule of thumb, this is not universal and doesn’t guarantee performance. The time needed will also depending on your educational background and personal circumstances. Study until you master the material, start early so you have a better idea of how much work you have ahead of you.
How does this translate to daily work? I’d recommend starting about 4 months before and put in 2-3 hours in daily, depending on your work schedule. Ramp up the hours, review and practice as you get into the last month.