Except for whilst I am shampooing and an hour afterward, my hair always has oil in it. I wash every 3 days.
Personally, I think oil can be left in as long as (a) it has not attracted a load of dust and fluff that is building up in your hair i,e, it has become dirty (b) your hair, scalp and facial skin are not reacting badly to the presence of the oil, and (c) the oil has not become rancid and smelly.
Applying oil, especially coconut oil, an hour or even overnight before you wash it off is a good thing to prevent protein loss and generally protect the hair.
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