Three hours. Soak the hand skewers in olive oil for three hours to soak them thoroughly. For Song Mingzi hand strings, you can use olive oil on a plate, but the amount should be appropriate and not too much. Soak the hand strings in olive oil for three hours to soak them thoroughly. Olive oil, a woody vegetable oil, is cold-pressed directly from fresh olive fruits without heating or chemical treatment, retaining natural nutrients. Olive oil is considered to be the most suitable for human nutrition among the oils discovered so far. grease.