Musannaf Ibn Abi Shaybah 19851 — How long is the waiting period

Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) said: "If I were able to make the waiting period ('iddah) of a slave woman one and a half menstrual periods, I would certainly have done so." A man said to him: "What if you made it a month and a half?" At this, Sayyiduna Umar (may Allah be pleased with him) remained silent.