For any given substance, the heat capacity of a body is directly proportional to the amount of substance it contains (measured in terms of mass or moles or volume). Doubling the amount of substance in a body doubles its heat capacity, etc.
Conventional soft contacts can last up to a year; conventional rigid gas permeable (RGP) contact lenses can last even longer. Frequent or planned replacement contact lenses last one to several months. Disposable contacts last from one day (daily wear) to up to two weeks (extended wear).
Store: If not wearing contact lenses immediately, store them in a closed lens case. Do not store your lenses in simple saline in place of Biotrue multi-purpose solution. Saline solution will not disinfect. Lenses may be stored in the unopened case until ready to wear, up to a maximum of 30 days.