Every cage is different as is the Parrot or Parrot(s) that use it as their Home. We have never set a number as that really does not address what is needed in different sections.
The most common area that most often missed is a place for your Parrot to hide from the World, either to just get away from the hubbub or to sleep with a comfort level that assures a solid nap or a nights sleep. These are commonly created by hanging style toys both on the outside to break-up a corner and its side walls a few addition hanging toys of the inside which surround the sleeping perch. Remember, sleeping perches are commonly higher and thicker than other perches.
Wing opening and use area. This is an open area that the Parrot can with easy open s/he wings fully and flap them.
The outside of the cage in areas that need some separation use hanging toys.
Foot toys, are a common add in toy that can be hung or allowed to lay on the top of the cage.
Room to play around and with the toys.
Have fun, BUT, remember that your Parrot may not like you switching out its full cage. Most Parrots view 'their' cage as 'their' area and allowing them view of the new toys for several days before they are installed helps everyone.
At some point you will find you Parrot avoiding something that you surprised them with -- this is call: the item is 'radioactive' and they will full avoid if forever or until they determine it will not hurt them or kill them.
NOTE: There will be those toys that for whatever reason, your Parrot HATES and they are best simply removed and disassembled and made it to different toys or bits added to other toys. It is commonly that toy that was fully recommended or you fell in love with, no, I haven't a clue why!
Enjoy!
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