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).
These1-2 week disposable contact lensescan be worn for 2 weeks with daily wear, or for six consecutive days and nights, under an extended wear model. Simply clean daily and replace every two weeks, or wear continuously for up to six days and replace with a fresh pair of contacts upon removal.