The timing of the Salat-ul-Witr (Witr prayer)

Narrated Anas bin Sirin:

I asked Ibn 'Umar, "What is your opinion about the two Rakat before the Fajr (compulsory) prayer, as to prolonging the recitation in them?" He said, "The Prophet ﷺ used to pray at night two Rakat followed by two and so on, and end the prayer by one Raka Witr. He used to offer two Rakat before the Fajr prayer immediately after the Adhan." (Hammad, the sub-narrator said, "That meant (that he prayed) quickly.)"

حَدَّثَنَا أَبُو النُّعْمَانِ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، قَالَ حَدَّثَنَا أَنَسُ بْنُ سِيرِينَ، قَالَ قُلْتُ لاِبْنِ عُمَرَ أَرَأَيْتَ الرَّكْعَتَيْنِ قَبْلَ صَلاَةِ الْغَدَاةِ أُطِيلُ فِيهِمَا الْقِرَاءَةَ فَقَالَ كَانَ النَّبِيُّ ﷺ يُصَلِّي مِنَ اللَّيْلِ مَثْنَى مَثْنَى، وَيُوتِرُ بِرَكْعَةٍ وَيُصَلِّي الرَّكْعَتَيْنِ قَبْلَ صَلاَةِ الْغَدَاةِ وَكَأَنَّ الأَذَانَ بِأُذُنَيْهِ. قَالَ حَمَّادٌ أَىْ سُرْعَةً.