The timing at that time.

Qutaybah b. Saʿīd > Jaʿfar > Abū ʿImrān al-Jawnī > Anas b. Mālik

"A time limit was set for us, by the Messenger of Allah ﷺ, regarding trimming the mustache, clipping the nails and plucking the pubes; we were not to leave that for more than forty days," on one occasion he said: "Forty nights."

أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا جَعْفَرٌ عَنْ أَبِي عِمْرَانَ الْجَوْنِيِّ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

وُقَّتَ لَنَا فِي قَصِّ الشَّارِبِ وَتَقْلِيمِ الْأَظْفَارِ وَحَلَقِ الْعَانَةِ وَنَتْفِ الْإِبْطِ أَنْ لَا نَتْرُكَ أَكْثَرَ مِنْ أَرْبَعِينَ يَوْمًا وَقَالَ مَرَّةً أُخْرَى أَرْبَعِينَ لَيْلَةً