00:00:00 It remains until the - azan in - > -

مَوْضِعُ الصَّلاةِ مِنَ الدّينِ كَمَوْضِعِ الرَّأْسِ مِنَ الْجَسَدِرسول الله حضرت محمد (صَلَّى اللَّهُ عَلَيْهِ وَ آلِهِ وَ سَلَمْ): (کنز العمال، ج 7، حدیث 18972)

Rasul Allah Hazrat Muhammad (Peace and blessings of Allah be upon him and his progeny):The position of prayers with respect to religion is similar to that of the head with respect to the body. Kanzul `Ummal: Vol. 7, h. 18972

You see the Kaaba from this angle while salah(praying).