Wahb ibn Munabbih said: Abdullah ibn Amr asked the Prophet ﷺ; In how many days should one complete the recitation of the Qur'an? He said: In forty days. He then said: In one month. He again said: In twenty days. He then said: In fifteen days. He then said: In ten days. Finally he said: In seven days. (Using translation from Abū Dāʾūd 1395)
أَنَّهُ سَأَلَ النَّبِيَّ ﷺ فِي كَمْ يُقْرَأُ الْقُرْآنُ؟ قَالَ «فِي أَرْبَعِينَ» ثُمَّ قَالَ «فِي شَهْرٍ» ثُمَّ قَالَ «فِي عِشْرِينَ» ثُمَّ قَالَ «فِي خَمْسَ عَشْرَةَ» ثُمَّ قَالَ «فِي عَشْرٍ» ثُمَّ لَمْ يَنْزِلْ يَعْنِي مِنْ سَبْعٍ وَهْبٌ لَمْ يَسْمَعْهُ مِنْ عَبْدِ اللهِ بْنِ عَمْرٍو