decadelong

or dec·ade-long

[ dek-eyd-lawng; British also duh-keyd-lawng ]

adjective

1. lasting for a decade:

   After a decadelong study, the drug has finally been approved by the FDA.

Example Sentences

Brown may hit a quad in Beijing, and I sincerely hope he does — not because I need him to do one, but because I’d love to see his decadelong effort rewarded.

From FiveThirtyEight

It grants the title of khenmo – the highest degree in Buddhist learning in the Nyingma tradition – to nuns who have completed a rigorous decadelong curriculum.

From No Straight News

Those granted probationary status would not be eligible for government benefits during the decadelong wait.

From The Daily Beast