What a great opportunity to share a post with us on Steemit ;+)!!!
I'm willing to say weeks in the fridge; but, why not wrap a teaspoon full in plastic wrap. Place one in the fridge, and leave one in a place you keep your cosmetics for a week. If they're both good, keep us up to date for a month.
I'm pretty sure they'll both be good in a month.
Peace.
thankyou x
:+)