How long is bacterial conjuctivitus contagious?

Not long: Bacterial conjunctivits (not viral conjunctivitis) in adults requires some breakdown of the surface of someone exposed. Bacteria cannot penetrate the normal defenses unless the eye has had surgery, is traumatized or has some surface disturbance. Anti-bacterial topical medications provide an excellent treatment and so the bacterial count will drops rapidly in 2 days or so.

Discharge: It is potentially contagious while discharge is present.