What is said about the Nawafil being offered as two Rak'a followed by two and so on

قَالَ مُحَمَّدٌ وَيُذْكَرُ ذَلِكَ عَنْ عَمَّارٍ وَأَبِي ذَرٍّ وَأَنَسٍ وَجَابِرِ بْنِ زَيْدٍ وَعِكْرِمَةَ وَالزُّهْرِيِّ رَضِيَ اللَّهُ عَنْهُمْ. وَقَالَ يَحْيَى بْنُ سَعِيدٍ الأَنْصَارِيُّ مَا أَدْرَكْتُ فُقَهَاءَ أَرْضِنَا إِلاَّ يُسَلِّمُونَ فِي كُلِّ اثْنَتَيْنِ مِنَ النَّهَارِ.And this has been narrated by ‘Ammar, Abu Dhar, Anas, Jabir bin Zaid, ‘Ikrima, and Az-Zuhri رضي الله عنهم. Yahya bin Sa’id Al-Ansari said, “I saw the religious learned men of our town (Al-Madina) offering two Rak‘a of Nawafil and finishing them with Taslim during the day.”