Al-Kāfi - Volume 5 > Permissible Time Length
Hadith #5

5- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ ابْنِ فَضَّالٍ عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ عَنْ رَجُلٍ سَمَّاهُ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنِ الرَّجُلِ يَتَزَوَّجُ الْمَرْأَةَ عَلَى عَرْدٍ وَاحِدٍ فَقَالَ لا بَأْسَ وَلَكِنْ إِذَا فَرَغَ فَلْيُحَوِّلْ وَجْهَهُ وَلا يَنْظُرْ.

5. A number of our people have narrated from Sahl ibn Ziyad from ibn Faddal from al-Qasim ibn Muhammad from a man whom he mentioned who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about the case of a man who married a woman (in the manner of al-Mut‘ah (advantageous marriage)) for only once going to bed. He (the Imam) said, ‘It is permissible, however, when the specified time ends he must turn his face away and must not look.’”