How many olives go into a litre of oil depends on the variety, ripeness and time of harvest. Ripe olives contain more oil, early harvested ones much less. 5 to 10 kilograms of olives per litre are typical.
It takes around 7,000 olives to make one litre of Ölich Olive Oil. Every single one harvested by hand and pressed within 8 hours of harvest. Something to think about with your next spoonful over a salad.