It depends on the severity of the infection and inflammation. It may be possible to recover from this illness within 24 hours by following these remedies if it's not severe. 1. Keep them hydrated by inhaling steam. A hot water shower is also an option. You can also inhale steam through it. 2. Before you go to sleep, use a humidifier. You won't get a good night's sleep if you have a nasal blockage. 3. A nasal decongestant can be used if hydration doesn't work. It is useful when needed.