High frequency cold corona is the ONLY choice for making ozonated oil IMHO. The higher the output, the quicker the oil is ozonated. Depending on how much money you got,hf cold corona machines can be purchased which produce Kilograms of ozone per hour, not milligrams.
Your typical oxygen fed home therapy ozonator outputting 1 gram ozone per hour will produce a litre of fully ozonated olive oil in 350 to 500 hours depending on several factors. On the other hand, an ozonator which produces 20 grams per hour will fully ozonate the same amount of oil in 20 hours or less.