‘A’isha said, “I said, ‘Messenger of Allah, if I know what night the Night of Power is, what do you think I should say during it?’
He said, ‘Say: “O Allah, You are Pardoning and you love pardon, so pardon me.”‘” (Tirmidhi)

اللْهُمَّ إِنَّكَ عَفُوٌّ تُحِبُّ الْعَفْوَ فَاعْفُعَنِّي

Allahumma innaka `afuwwun tuhibbul `afwa fa`fu `annee

No limitation is applied, so you can read this dua as much as possible