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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 other words, so many variables affect the length of time it takes for an individual item to break down into a fully decayed pile of matter that you'll only know the answer once the process is complete. Still, certain factors help predict if you are talking about weeks, months or years to obtain finished compost.n 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.