IMO

Erotic Allure + Manageability = Length

Erotic Allure: Ability to excite, or arouse oneself and/or others

Manageability: Caring, nurturing, control, etc.

Question: When does hair that is too long loose its erotic allure and manageability?

Answer: Who Knows?

Conclusion:

Everyone's unique and different.

What's important is to keep it healthy, loooong, silky and shiny...

Tecra