From Longman Dictionary of Contemporary Englishweeklongweek‧long /ˈwiːklɒŋ $ -lɒːŋ/ adjective [only before noun] PERIOD OF TIMEcontinuing for a week a weeklong training course
Examples from the Corpus
weeklong• On July 13, the weeklong executions began.• The program coincides with Surf the Rockies, a weeklong festival April 7-14.• a weeklong music festival• At least 300 people were killed during the weeklong riots. 