Answered by Shaykh Amjad Rasheed
Is it permissible for a man to grow his hair as long as he wishes? Is there a limit to the length of a man’s hair according to the Shari’ah?
There is not limit set on the length of men or women’s hair in the Shari’ah. However, one must be cautious in the case of a man growing his hair that he does not intend thereby imitation of women, the irreligious or the imprudent. Because his intending so is unlawful.
– Amjad Rasheed
(Translated by Sr Lida Kahi)