Al-Kāfi - Volume 5 > Permissible Time Length
Hadith #1

1- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ عَلِيِّ بْنِ رِئَابٍ عَنْ عُمَرَ بْنِ حَنْظَلَةَ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ يُشَارِطُهَا مَا شَاءَ مِنَ الأيَّامِ.

1. A number of our people have narrated from Sahl ibn Ziyad from ibn Mahbub from ibn Ri’ab from ‘Umar ibn Hanzalah who has said the following: “Abu ‘ Abd Allah, ‘Alayhi al-Salam, has said, ‘He can arrange for a mutual agreement with her for any number of days they want.’”