How long does vegatable cooking oil keep?

Those metal spouts usually have a plastic or rubber end attached to the end of the spout for covering. Most of the time that covering isnt necessary with olive oil. Vegetable oil should be covered well. I reuse my olive oil alot and keep it in a little plastic container with a lid, simple.Cooking oil like veggie and canola usually lasts a very long time if its bottled well, dont let it air out too much.