Hello.. The loss of smell post covid might stay till 6-12 months(longest)... -Start with spray fluticasone furate 1 puff twice a day for 1 month.. -Tab montek LC once at night time - smell training ...open a jar of a particular scent and focus on their memory of that smell for at least 20 seconds while attempting to minimize distractions or other thoughts. They then move on to the next scent. A full course of training repeats this activity twice daily for several weeks.