The Prophet ﷺ did istighfār one hundred times a day
MUSLIM 2702a:
from al-Aghar al-Muzanī —
that the Messenger of Allah ﷺ said, "There is ˹at times˺ a sort of shade upon my heart, and I seek forgiveness from Allah a hundred times a day."
مسلم ٢٧٠٢a:
عن الاغر المزني —
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ: «إِنَّهُ لَيُغَانُ عَلَى قَلْبِي وَإِنِّي لأَسْتَغْفِرُ اللَّهَ فِي الْيَوْمِ مِائَةَ مَرَّةٍ۔»