من لا يحضره الفقيه, volume 3, page 464

Hadith.4605 - Musa ibn Bakr narrated from Zurara, who said: I heard Abu Ja'far Imam Muhammad ibn Ali Al-Baqir (as) saying: "The waiting period ('Iddah) for Mut'ah (temporary marriage) is forty-five days." Imam (as) then demonstrated by holding up his hand and showing forty-five days. "When the specified term ends, the separation occurs without the need for divorce."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.4606 - Safwan ibn Yahya narrated from Abdur-Rahman ibn Al-Hajjaj, who said: I asked Abu Abdullah (as) about a woman who entered into a Mut'ah (temporary marriage) and then her husband passed away. Imam (as) said: "She must observe an 'Iddah (waiting period) of four months and ten days." Then Imam (as) continued: "If her term ends while he is still alive, her waiting period is one and a half menstrual cycles, similar to what is required for a female slave." I asked: "Does she need to observe mourning (Hadd)?" Imam (as) replied: "Yes, but if she stayed with him for a day, two days, or even just an hour during the day, the waiting period becomes obligatory, but mourning (Hadd) is not required."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.