We are most knowing of what they say when the most eminent of them say: "You didn’t remain except one day".
It is told in verses 89: 23-24: “On the Day when Hell is brought near, man will remember that how better it would have been if he had used the Book Dhikra, and he will regret that he wasted his life in this world”. It is told in verses 23: 112-113 ”Lord asks: "How long did you remain on earth?". The inmate of Hell will reply: ‘We didn’t remain except a day or part of a day; ask those who enumerate’."
The Arabic Quran reading Fujjar who hide and reject Adhikr are leading an aimless and heedless life in this world. So they will feel on the Day of Judgment that they did live only for a few hours in the worldly life. See explanation 18: 19.