What is the ruling on a divorced woman who claims that her waiting period ended within twenty days?

The questioner : Is the claim of the one who chooses a specific duration for menstruation accepted? If a woman claims her waiting period ended in twenty days based on the opinion of a specific scholar, is the claim of the one who holds the stronger position accepted?

The Shaykh : No, that is not it.

The questioner : She took one day.

The Shaykh : Yes, if this is her custom, it is established if she says, "This is my custom."

The questioner : Even if... but twenty days.

The Shaykh : That is possible.