I went to the drugstore today and bought Covergirl’s Lashblast. I already opened and used it. My friend just got me two tubes of Maybeline mascara. She said that it was such a good deal she couldn’t pass it up and she doesn’t wear mascara. I don’t want to give the mascara away because it was a gift, and I’m the only person I know who has such a love of mascara. If mascara remains unopened, how long will it last?