Reference: Siyar A’laam an-Nubalaa – Volume 17, Page 190
[Regarding Ibn al-Baaqillaanee], Abu Bakr al-Khateeb said:
His set portion [of worship] every night was [to pray] twenty rak’ahs whilst at home and [also when on] travels; and when he would be done with them, he would write thirty five pages of his book.
