The rest of your life.
I have 10 categories.
Start with main list, brainstorm profusely, cut it down to a managed set of wishes,hopes,goals,dreams. Add,Subtract,Multiply,Divide.
Rearrange, as you find your life changing into a pattern of growth and expression.
Purpose is the only static decision to polish. Most likely you will only have 5 or less purposes for your life. Start with purpose and the length of your plan will follow the main heartfelt approaches which make you unique in this life.
Or something like that...hope this helps.