The word(s) "hour" appears 77 time(s) in 63 verse(s) in Quran in Mohsin Khan translation.

(31) And on the Day when the hour will be established, the Mujrimun (disbelievers, sinners, criminals, polytheists) will be plunged into destruction with (deep regrets, sorrows, and) despair.

(32) And on the Day when the hour will be established - that Day shall (all men) be separated (i.e. the believers will be separated from the disbelievers).

(33) And on the Day that the hour will be established, the Mujrimun (criminals, disbelievers, polytheists, sinners) will swear that they stayed not but an hour - thus were they ever deluded [away from the truth (i.e. they used to tell lies and take false oaths, and turn away from the truth) in this life of the world)]

(34) See you not (O Muhammad صلى الله عليه وسلم) that Allah merges the night into the day (i.e. the decrease in the hours of the night are added to the hours of the day), and merges the day into the night (i.e. the decrease in the hours of day are added to the hours of night), and has subjected the sun and the moon, each running its course for a term appointed; and that Allah is All-Aware of what you do.

(35) Verily Allah, with Him (Alone) is the knowledge of the hour, He sends down the rain, and knows that which is in the wombs. No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All-Knower, All-Aware (of things).

(36) People ask you concerning the hour, say: "The knowledge of it is with Allah only. What do you know? It may be that the hour is near!"

(37) Those who disbelieve say: "The hour will not come to us." Say: "Yes, by my Lord, the All-Knower of the Unseen, it will come to you; not even the weight of an atom (or a small ant) or less than that or greater escapes His Knowledge in the heavens or in the earth but it is in a Clear Book (Al-Lauh Al-Mahfuz).

(38) Say (O Muhammad صلى الله عليه وسلم): "The appointment to you is for a Day, which you cannot put back for an hour (or a moment) nor put forward."

(39) He merges the night into the day (i.e. the decrease in the hours of the night is added to the hours of the day), and He merges the day into the night (i.e. the decrease in the hours of the day is added to the hours of the night). And He has subjected the sun and the moon: each runs its course for a term appointed. Such is Allah, your Lord; His is the kingdom. And those, whom you invoke or call upon instead of Him, own not even a Qitmir (the thin membrane over the date-stone).

(40) Is one who is obedient to Allah, prostrating himself or standing (in prayer) during the hours of the night, fearing the Hereafter and hoping for the Mercy of his Lord (like one who disbelieves)? Say: "Are those who know equal to those who know not?" It is only men of understanding who will remember (i.e. get a lesson from Allah's Signs and Verses).