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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.
In Composting for Dummies, Cathy Cromell estimates a 3 1/2- to six-month wait for usable compost. For best results, built a compost pile at least 1 cubic yard in volume.Turn the pile weekly and add water, and you'll have a hot pile that can yield at least some compost within two months.After screening, you can return uncomposted pieces to the heap. (See References 5, page 187).n a regular compost heap, where bacteria and fungi do the work rather than worms, pine needles and sawdust take a long time to break down, as do fats, for reasons having to do with their carbon-to-nitrogen ratios. (See References 1).