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).
In the fifth day, you can wear it within 12 hours, but the regular wearing time for the ordinary contact lenses is 8 hours. For the rigid gas permeable contact lens, the wearing time is between 10 and 12 hours, so it all depends on the oxygen permeability of the contact lens. 09/10/2012. good (0) Report Abuse.