And on the Day when He will gather them, [it will be] (10:45)

Almuntakhab Fi Tafsir Alquran Alkarim

On the Day He throngs them before Him for judgement, they shall bring back to the mind their life below appearing to them, then, as though it had lasted for no more than one hour of the time of daylight, and they shall recognize each other by the distinctive features, the appearance and the character. There and then shall the losers be those who denied Resurrection and the audience of Allah, who were misdirected in action and thought and had the wrong purpose and intention

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(10:45) (But today they are oblivious of everything except enjoyment of worldly life.) And on the Day when He will muster all men together, they will feel as though they had been in the world no more than an hour of the day to get acquainted with one another. *53 (It will then become evident that) those who called the lie to meeting with Allah *54 were utter losers and were not rightly-directed. underlies this sharp remark is the faint hope that perhaps such people would be shaken out of their slumber.

And on the Day when He will gather them, [it will be] meaning

*53). A time will come when such people will, on the one hand, come face to face with the infinite life of the Hereafter, and on the other, they will took back at their past worldly life and realize how puny it was as compared to the life ahead. It is then that they will comprehend what folly they have committed by ruining their eternal future for the sake of ephemeral pleasures and benefits in this worldly life.
*54). This refers to the unbelievers' rejection that a time will come when everyone will have to stand before God for His judgement.
 

And on the Day when He will gather them, [it will be] meaning in Urdu

(آج یہ دُنیا کی زندگی میں مست ہیں) اور جس روز اللہ اِن کو اکٹھا کرے گا تو (یہی دُنیا کی زندگی اِنہیں ایسی محسُوس ہوگی) گویا یہ محض ایک گھڑی بھر آپس میں جان پہچان کرنے کو ٹھیرے تھے (اس وقت تحقیق ہو جائے گا کہ) فی الواقع سخت گھاٹے میں رہے وہ لوگ جنہوں نے اللہ کی ملاقات کو جھٹلایا اور ہرگز وہ راہِ راست پر نہ تھے