Girl, thats not a silly question at all. It is asked alot
I agree with the others-- the seal oil creates is not permanent. I'm guessing it depends on the type of oil you use, how heavily you apply it, the style you are wearing, and the relative porosity of your hair.
The type of oil you use matters because some are heavier than others. Sealing with castor oil will probably last longer than sealing with coconut or almond oil. The amount of oil you use matters for obvious reasons, the thicker the seal the longer it will linger.
The style you are wearing matters as well. If you wear your hair bunned, your seal may last longer than if you were to wear say a braidout or something. Anything exposed to the air will dry out faster than something tucked out of sight.
Then, porous hair will not stay moisturized or sealed as long as hair that is less porous.
Since I am relaxed and color treated, my hair tends to err on the porous/dry side. This is why I usually end up moisturizing and sealing once or twice a day. There is a point though, where buildup is a factor and the hair becomes coated. I can repeat my cycle of moisturizing and sealing for about 3 days before my hair starts accumulating stuff. By day 3, my hair becomes limp and basically anything applied at this point would be useless. Moisturizers don't absorb, they just sit there. This is how I know I need to wash my hair and start all over again. Some people can moisturize and seal once and have it last for days at a time.
I can't comment on cone-a-licious serums though because I've never used any.
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