سُبْحَانَ ٱللَّٰهِ
Holy Qur'an
Al-Qur'an
Kids Qur'an
Namely until the end of each person's life - implying that although they might be forgiven all sins committed before their postulated change of heart, they would henceforth, until their death, be held fully accountable for their behaviour in the light of that new-found faith. Cf. 4:18 - "repentance shall not be accepted from those who do evil deeds until their dying hour and then say, 'Behold, I now repent'".
Meaning, it is out of Allah’s mercy that He does not hasten your punishment but allows you more time to repent.
Allah gives respite freely; but it is for Him to give it. His command is definite and final; neither man nor any other authority can alter or in any way modify it. If we could only realise this to the full in our inmost soul, it would be best for us and lead to our happiness.