If you have the symptoms of conjunctivitis how long does it take to clear up?

Depends on cause! Conjuctivitis can be allergy related, infectious (viral or chlamydial), or autoimmune (associated with a number of types of arthritis), such as spondylitis. The allergic one can be treated with histamine blockers and singulair (montelukast). Viral goes away in short order. Doxycyline or zithromax for chlamydia. The arthritis will last the longest and requires treatment of the underlying disease.