decade-long

adjective

de·​cade-long ˈde-ˌkād-ˌlȯŋ 

variants or less commonly decadelong

: lasting or occurring over a decade or about a decade

A decade-long drought in Saskatchewan and Alberta nesting areas has cut sharply into the number of birds migrating into Idaho …

—Dan Knauss

The renegade gene that causes Huntington's disease has been found after a decade-long search …

—Daniel Q. Haney

Word History

First Known Use

1974, in the meaning defined above