The word(s) "hour" appears 53 time(s) in 48 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) But they reject the hour, and We have prepared a burning fire for him who rejects the hour.

(22) And at the time when the hour shall come the guilty shall be in despair.

(23) And at the time when the hour shall come, at that time they shall become separated one from the other.

(24) And at the time when the hour shall come, the guilty shall swear (that) they did not tarry but an hour; thus are they ever turned away.

(25) Surely Allah is He with Whom is the knowledge of the hour, and He sends down the rain and He knows what is in the wombs; and no one knows what he shall earn on the morrow; and no one knows in what land he shall die; surely Allah is Knowing, Aware.

(26) Men ask you about the hour; say: The knowledge of it is only with Allah, and what will make you comprehend that the hour may be nigh.

(27) And those who disbelieve say: The hour shall not come upon us. Say: Yea! by my Lord, the Knower of the unseen, it shall certainly come upon you; not the weight of an atom becomes absent from Him, in the heavens or in the earth, and neither less than that nor greater, but (all) is in a clear book

(28) What! he who is obedient during hours of the night, prostrating himself and standing, takes care of the hereafter and hopes for the mercy of his Lord! Say: Are those who know and those who do not know alike? Only the men of understanding are mindful.

(29) The fire; they shall be brought before it (every) morning and evening and on the day when the hour shall come to pass: Make Firon's people enter the severest chastisement.

(30) Most surely the hour is coming, there is no doubt therein, but most people do not believe.