The duration of results from a hair treatment can vary depending on the type of treatment and individual factors. Generally, temporary treatments like hair masks or deep conditioning might provide benefits for a few days to a week. Semi-permanent treatments like hair color can last anywhere from 4 to 6 weeks before fading. Permanent treatments such as chemical straightening or perming can last several months, often until new hair grows in. It’s important to follow proper aftercare and use recommended products to prolong the effects of any hair treatment. Regular maintenance can also extend the longevity of the results.