HOW LONG DOES THE FRAGRANCE LAST? May 05, 2017 The fragrance and odor neutralizer in Alio are expected to last up to 30-45 days. We recommend you flip the reeds periodically for optimal use. By Karen Chang SHARE: RELATED ARTICLES HOW LONG DOES THE FRAGRANCE LAST? May 05, 2017 HOW LONG DOES THE FRAGRANCE LAST? May 05, 2017 HOW LONG DOES THE FRAGRANCE LAST? May 05, 2017 back to posts