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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.
But how long does it take for non-compostable items to break down?? According to our research the following is the estimated time for some everyday items that are all around us to decompose in landfill sites: Plastic bottles: 70-450 years ; Plastic bag: 500-1000 years ; Tin can: around 50 years ; Leather shoes: 25-40 years ; Thread: 3-4 months