Viral Conjunctivitis. Most cases of viral conjunctivitis are mild. The infection will usually clear up in 7–14 days without treatment and without any long-term consequences. In some cases, viral conjunctivitis can take 2-3 weeks or more to clear up, especially if complications arise.Artificial tears and cold packs may be used to relieve the dryness and inflammation (swelling) caused by conjunctivitis.he treatment for conjunctivitis depends on the cause. It is not always necessary to see a healthcare provider for conjunctivitis. But, as noted below, there are times when it is important to seek medical care.