 There's a reason your hair isn't this long, and it has nothing to do with how often you cut it. The factor of the matter is, having long hair might just not be in your genes. Your genetics impact the growth phase of your hair, which lasts a few years and varies from person to person. Some people have a growth phase of two years, while other growth phases could last for six years, making their hair three times as long. So yes, while getting regular trims may make your hair look and feel healthier, it's not going to turn you into a Rapunzel.