It can take years if it is packed tightly in sheets with little surface area exposed to the elements, as in landfills. In a home garden, cardboard used as mulch – shredded and soaked with water – the cardboard can decompose rather quickly and be completely broken down by microorganisms within 3 months
Her reliability is generally good but not strong, considering she has had no first hand formal instruction on vehicles, all of her experience is considered secondhand.
