From Longman Dictionary of Contemporary Englishyear-longˈyear-long, yearlong /ˈjɪəlɒŋ, ˈjɜː- $ ˈjɪrlɒːŋ/ adjective [only before noun]PERIOD OF TIMEcontinuing for a year or all through the yeara year-long study of the problemExamples from the Corpusyear-long• Uricacidproduction had helped this animal to survive a year-longfast without one drink of water.• For a $ 500 initiationfee, plus $ 85 a month, girls will receive a year-longmembership in the academy.• This stemmed from a need to give the regularcastholidays during the otherwise punishingyear-long recording schedule.