He will say, "You stayed not but a little - if only you had known.
The Saheeh International Quran Translation
قَٰلَ إِن لَّبِثْتُمْ إِلَّا قَلِيلًا لَّوْ أَنَّكُمْ كُنتُمْ تَعْلَمُونَHe will say, "You stayed not but a little - if only you had known.