As in how many days is it usual to be coughing one's guts up, not how long a typical coughing fit lasts.
Never open doors if you don't dare to walk on through ...
Dictators ride to and fro upon tigers which they dare not dismount and the tigers are getting hungry
Boots will have these. They stop the cough and let you sleep. As they contain the cough suppressant Dextromethorphan
If you need an expectorant too, if you still are coughing up junk look for combos of Dextromethorphan and Guafeninsin
It has been over a month so far here and I'm still coughing.