decades-long
adjective
de·cades-long
ˈde-ˌkādz-ˌlȯŋ
variants
or less commonly decadeslong
: lasting two or more decades : occurring over a period of two or more decades
… no discussion of wolf research would be complete without mention of this fascinating, decades-long study.—Robert R. Ream
His decades-long accumulation of books makes an eclectic mix …—Stephen Mihm
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Merriam-Webster unabridged
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