How long does corn oil last?

If kept tightly sealed and refrigerated it will keep for a long time, probably at least 6 months. If not refrigerated (but well sealed) it should be fine for a month or two. If it is clear and does not smell rancid, it is probably fine (assuming it is less than 6 months old) . Oil exposed to air will turn rancid rapidly - in a few days or less. In any case, it should at least be kept in a cool, dark, place. (Refrigerated oil may appear cloudy until warmed up - that's OK. I started refrigerating mine a year or two, and it has dramatically extended the lifetime of the oil as described.)