About how long does it take for otitis media with effusion to clear on average, and will the ringing in my left ear stop with it? it came from a uri.

Within 3 months: Typically ~90% of patients will clear the effusion within 3 months. Taking medications such as a topical decongestant (nasal steroids) may speed the recovery. If the effusion doesn't clear, then you should see an ENT to make sure the eustachian tube isn't blocked. An ear tube or a simple drainage procedure may be needed. For most patients w/o any other ear issues, the ringing should stop.