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).
If it's saline for contact lenses chances are it contains preservative and will last for 60 days after opening - check the label on the bottle. If it's normal saline for injection with a bactericide it will last for 30 days - again check the label. Votes: +0. Comment Vote up Report.