It was a time when no one would come in to see him. She meant that the Prophet ﷺ would pray two rakahs when dawn broke and the caller announced the prayer.Ayub said, "I think he said, two light rakahs."
حدثنا إسماعيل بن إبراهيم قال حدثنا أيوب عن نافع عن ابن عمر قال و
وكانت ساعة لا يدخل عليه فيها أحد أنه كان يصلي ركعتين حين يطلع الفجر تعني النبي ﷺ وينادي المنادي بالصلاة قال أيوب أراه قال خفيفتين
Its isnad is sahih. Bukhari narrated it, 2/101, no. 618, in the chapter on adhan, Muslim, 1/500, no. 723, in the chapter on travelers, Tirmidhi, 2/298, no. 433, saying it is hasan sahih, Nasai, 1/283, no. 583, Ibn Majah, 1/362, no. 1145, Abd bin Humayd, p. 446, no. 1546, Humaydi, 1/38, no. 288, and Malik, 1/27, no. 29.