Does anyone have any experience with or know how long an opened tub of shaving cream will last? I.e. do you think it will dry out after say 6 months to a year if opened but not used? I would like to purchase a different scent of the AOS shave cream in the tub, but I'm worried that if I alternate 2 tubs of these, that I will not use them fast enough and they will dry out. If they lids are tightly sealed should I be worried about this?