To meet the ISO 14855 standard for biodegradable plastics, compostable cutlery must meet be at least 34.2% degraded after 45 days and 65.6% biodegraded after 93 days. It should compost at about the same rate as paper.
If you are using a composting system at home, it will take around 18 months. In an industrial composting environment, it will take a biodegradable spoon (or any utensil) anywhere from six to 12 months to break down.
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