You’re good for ten to fifteen years. Buckwheat pillows do not support dust mite infestations. Every six month you just open the concealed
zipper when you wish to wash the cover, pour out the buckwheat hulls on a cookie sheet or baking pan and place them in the sun while the cover is washing and drying. Then you simply replace the hulls, which do not, remember, support dust mite infestations. The sun will dry out any moisture your hulls are holding.