How long do tea bags take to compost? 28 April 2021 13:16 Updated This will take between 1 to 2 years, which is typical of most tea bags not just a Fortnum’s bag. Related articles Why are your tea bags wrapped in a plastic envelope? Are your teas gluten-free? Will the tea bags breakdown in my home compost? How to do you dispose of the string and tag attached to the tea bag? Can I change the date of the delivery?