Does the phrase "regular cessation of vaginal moisture" mean that this occurs at specific hours of the day, such as its cessation from four to five o'clock daily?

The meaning of the cessation of vaginal wetness, which negates the ruling of perpetual impurity (sahibat al-salas) for its owner, is its cessation for a time sufficient for purification and prayer. However, if it continues such that it does not cease for a time sufficient for that, or if its cessation is irregular, then her ruling is that of someone with perpetual impurity. In such a case, she performs ablution for each prayer after its time has begun and prays the obligatory prayer and whatever supererogatory prayers she wishes.