In the Name of Allâh, the Most Beneficent, the Most Merciful
Pubic hair and prayer not accepted.
Sahih Al-Bukhari Hadith 7.779 Narrated by Abu Huraira
I heard the Prophet (saws) saying. "Five practices are characteristics of the Fitra (nature): circumcision, removing the pubic hair, cutting the moustaches short, clipping the nails, and depilating the hair of the armpits."
Both the believing men and the believing women are obliged to remove their unwanted hair from their pubic region and from under their armpits. One may use any means or method to remove the unwanted hair including clipping, shaving, the use of chemicals, etc.
It would be a characteristic of fitrah or nature to remove any unwanted hair; and unwanted hair would normally mean the growth of hair in the pubic region, the armpits and the mustache for men. The only hair which Islam specifically prohibits the believing women to leave unaltered is the hair on her eye-brows, and the growth of the beard for the believing men; other than those, there is no restriction if one wishes to remove hair from other parts of ones body.
To the best of our knowledge there is nothing in the Quran and the Sunnah which declares that ones prayer will not be accepted if one does not remove ones hair from ones pubic or armpit region.
Hadrat Anas ibn Maalik (r.a.) who served the Messenger of Allah (saws) for ten years, said: "The time period for us to trim the moustache, cut the nails, pluck out the underarm hairs and cut the pubic hairs was forty nights."
Related by Ahmad and Abu Dawud.
There is no specific number of days specified by the Messenger of Allah (saws) for the removal of unwanted hair, but some of the companions have said that they used to remove their unwanted hair in a maximum period of every 40 days.
Whatever written of Truth and benefit is only due to Allahs Assistance and Guidance, and whatever of error is of me alone. Allah Alone Knows Best and He is the Only Source of Strength.