Duration of hoarseness caused by an allergy
The Heiserkreit basically lasts as long as the allergy-causing substance comes into contact with the body. Particularly a load of the respiratory tract by the allergen is to be considered, since thereby the irritation of the vocal chords and the hoarseness developing thereby is probable. A good indication of whether the allergen currently still stresses the body is the occurrence of other allergic symptoms.
If these symptoms subside, the hoarseness should also disappear soon. As the mucous membrane needs some time to regenerate, you should be a little more patient and give it about 24 hours after the remaining symptoms have subsided.