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decadelong

or decade-long

[dek-eyd-lawng; British also duh-keyd-lawng] /ˈdɛk eɪdˌlɔŋ; British also dəˈkeɪd lɔŋ/
adjective
1.
lasting for a decade:
After a decadelong study, the drug has finally been approved by the FDA.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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10
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