How often did the Greeks use olives for wine?

The Greeks didn't use olives for wine. Olives are fruits, while wine is made from fermented grapes.

There may be some confusion here. Perhaps you are thinking about the following:

* Olive oil: Olive oil was often used in ancient Greece for flavoring and cooking food, including dishes that might have been served with wine.

* Olive branches: Olive branches were highly symbolic in Greek culture, representing peace, victory, and prosperity. They were sometimes used in religious ceremonies and celebrations.

It's important to note that olive trees and grapevines both hold significant cultural importance in Greece, but they are distinct plants with different uses.