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When I first ventured into composting, I found that nut waste was one of the most difficult things to deal with. After some research, I found that chemically it can take 2 to 3 years for the shells to decompose. My recommendation would be to grind up the shells if you are adding them to your compost pile. They will still take time to break down, but it adds a nice bulk to your compost.
Size. Of course, the size of your compost pile also influences how fast it decomposes. If your pile is too small, it may not be able to generate enough heat to decompose materials. On the other hand, large piles may not receive enough oxygen.he amount of time it takes for compost to complete the decomposition process depends on a variety of factors, so research various composting techniques before you decide what kind of compost pile to create. Other People Are Reading.