وَيُكْثِرُ مِنَ التَّلْبِيَةِ عَقِبَ الصَّلَوَاتِ، وَكُلَّمَا عَلَا شَرَفًا، أَوْ هَبَطَ وَادِيًا، أَوْ لَقِيَ رُكْبَانًا، وَبِالْأَسْحَارِ.
Translation: The pilgrim should frequently recite talbiyah after prayers, on ascending high ground, descending a valley, meeting fellow riders, and in the pre-dawn hours.
Yukthiru means to increase or frequently repeat. These situations are recommended occasions for remembrance, not an exhaustive list of the only permissible moments.
Asḥār means late-night or pre-dawn periods; sharaf is high ground and wādī a valley.