Yeah we inherited about 100 large trees when we bought our farm.
They are tougher than gumtrees, never watered or fertilized though we have a decent rainfall and thrive on neglect .
Just have to prune off the lower branches and use a pole saw to cut off the tops as they get too tall.
Since then we have made oil {, crushed about 1 hr away] or done table olives for the last 15 years.
I love olives to eat, as flavouring in cooking , dip bread in theoil ,sometimes we make olive and anchovy tepanade, .
The oil and olives will keep for years in the cool and dark.