Gray nail is nail fungus. It takes about 2-12 months to gradually get better after applying medication for onychomycosis. Factors affecting the recovery time mainly include the severity of gray nails, the location of gray nails, and the timeliness of treatment. 1. severity: if the gray nail degree is high, the area is larger, the number is larger, the treatment difficulty is relatively elevated, after applying the medicine may need about 6-12 months to gradually get better. If the gray nail area is small and the number of gray nails is small, the treatment difficulty is relatively low, and it will take about 2-5 months to get better after applying the medicine. 2. Gray nail part: if the gray nail appears in the hand part, it can be gradually improved in about 2-3 months after applying the medicine; if the gray nail appears in the foot part, its treatment difficulty is relatively high, and the recovery time after applying the medicine is relatively long, which may need 6-12 months. 3. Timeliness of treatment: if you just infected with gray nails, timely and regular treatment, can effectively curb the condition of gray nails before widespread infection, shorten the treatment time, and its recovery time is relatively short, it may take 2-3 months to gradually recover. If untimely treatment after infection of gray nail causes infection of surrounding finger/toenails, its treatment is more difficult and may take 6-12 months for recovery. If you have gray nails, you should go to the hospital in time for examination, and after a clear diagnosis, you should carry out targeted treatment as soon as possible to prevent the condition from worsening and causing other physical problems.