The effective duration is essentially dependent on the absorption rate and capacity of the desiccant. In turn, this is defined largely by the ambient climate.
Each substance – so desiccants as well – is compelled to seek moisture balance. The absorption of water by objects such as products, packaging, or desiccants will rise in a directly proportionate relationship with the humidity present in the system.
It follows, therefore, that low desiccant doses will usually attempt to absorb water at a faster rate – and hence reach saturation more quickly – as there is less material available to accommodate the moisture. The duration of effective dehumidification can be adjusted using several desiccant pouches. The various climate zones encountered along the route, as well as the climate during loading and unloading, are relevant factors as well.