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).
I have worn contact lenses for 25 years without a complaint. Bought a 6 month supply of the 1 Day Moise and maybe I have a bad batch, but many, many of the lenses are uncomfortable and blurry. It takes 3-4 lenses to come up with one that is good every morning.