When and where you grew up and how continent was defined will change this. It ranges from 4-7 IIRC based on where you grew up. There are some good YouTube videos on the subject that shows, however you want to measure it, there are issues with consistency.
When and where you grew up and how continent was defined will change this. It ranges from 4-7 IIRC based on where you grew up. There are some good YouTube videos on the subject that shows, however you want to measure it, there are issues with consistency.