An umm walad who is freed: how long is her waiting period?

Yahya bin Abi Kathir (may Allah have mercy on him) said: Sayyiduna Amr bin al-As (may Allah be pleased with him) ordered an umm walad who had been set free to observe a waiting period of three menstrual periods, and he wrote this decision to Sayyiduna Umar (may Allah be pleased with him). Sayyiduna Umar (may Allah be pleased with him) approved of his opinion.

Al-Hasan used to say: When an umm walad is set free, her waiting period is three menstrual periods.

Ibrahim (may Allah have mercy on him) said: If he sets the umm walad free, or dies leaving her behind, her waiting period is three menstrual periods.

Makhul (may Allah have mercy on him) said: If a man sets his umm walad free, her waiting period is two menstrual periods.

And al-Zuhri said: Three quru'.

Jabir bin Zayd was asked about a man who sets free his concubine (a slave woman with whom he had marital relations) while he is in good health. He said: She will observe a waiting period of three quru' if she menstruates; and if she does not menstruate, her waiting period is three months, if someone else is to marry her.

Sayyiduna Ibn Umar (may Allah be pleased with them both) said: The waiting period of an umm walad is one menstrual period, whether she is set free or her master dies.