Is that the A4 you want?
I played nine holes recently with a friend where I said I wanted him to do nothing but watch how long my backswing was. It was the only thing I focused on.
I felt like it stopped at vertical, and so it went about 45° beyond that. I made some that probably went 60° beyond, he said, but none got close to even parallel.
Every swing. For nine holes. Including driver.