LONGEVITY: * Unable to determine. The amount of time it stays cold depends on the conditions it is used in.USAGE: * Can be used for hot or cold applications. * Bricks may be reused, providing the internal foam core is not broken or cracked. * Freeze time: Allow 2 days for a whole case.SHELF LIFE: Foam- 1 yearTHICKNESS: * Poly Covering: 5.25 milMISCELLANEOUS: * Cannot be frozen in an ultra low freezer. Poly exterior can withstand temperatures of 0 C/30 F.