AFAIR (I had a grill pan that I had to cover with a bit of oil) it would be 1-2 weeks (based on my memory of doing "grilling") Thin layer of oil out in the ope

AFAIR (I had a grill pan that I had to cover with a bit of oil) it would be 1-2 weeks (based on my memory of doing "grilling") Thin layer of oil out in the open goes bad quicker than oil closed in a bottle.