How long does a First Aid Only instant cold packs stay cold?

This typically varies by the environment the product is used in, but typically the pack will stay cold anywhere from 5-15 minutes. 

This would be true of all products below:

K2104	4"x5" Instant Cold Pack
21-004-001	4"x5" Instant Cold Pack, 1/box
B503-5	4"x5" Instant Cold Pack, 1/box (5 Count)
21-4000	6"x9" Instant Cold Pack, Large Size
M564-E	6"x9" Instant Cold Pack, Large Size, 1/box