the response to treatment is very individualized. depending on the severity of the sinusitis the accuracy of the diagnosis the choice/dosage of antibiotic and thepatient's response to those antibiotics one could remain symptomatic for a week or more. since most sinus infections are viral the will (eventually) go away on their own. the one's that require antibiotics may last a week or more.
how long does a sinus infection last? . have had it since first of march - taken 10 days of strong antibiotic and then 10 days of strong musinex - getting better - will it eventually go away on it's own?