The word(s) "when" appears 916 time(s) in 828 verse(s) in Quran in Mohsin Khan translation.

(351) And give full measure when you measure, and weigh with a balance that is straight. That is good (advantageous) and better in the end.

(352) And when you (Muhammad صلى الله عليه و سلم) recite the Qur'an, We put between you and those who believe not in the Hereafter, an invisible veil (or screen their hearts, so they hear or understand it not).

(353) And We have put coverings over their hearts lest they should understand it (the Qur'an), and in their ears deafness. And when you make mention of your Lord Alone [La ilaha illallah (none has the right to be worshipped but Allah) Islamic Monotheism (توحيد الله)] in the Qur'an, they turn on their backs, fleeing in extreme dislike.

(354) We know best of what they listen to, when they listen to you. And when they take secret counsel, then the Zalimun (polytheists and wrong-doers) say: "You follow none but a bewitched man."

(355) And they say: "when we are bones and fragments (destroyed), should we really be resurrected (to be) a new creation?"

(356) "Or some created thing that is yet greater (or harder) in your breasts (thoughts to be resurrected, even then you shall be resurrected)." Then, they will say: "Who shall bring us back (to life)?" Say: "He Who created you first!" Then, they will shake their heads at you and say: "when will that be?" Say: "Perhaps it is near!"

(357) On the Day when He will call you, and you will answer (His Call) with (words of) His Praise and Obedience, and you will think that you have stayed (in this world) but a little while!

(358) And (remember) when We told you: "Verily! Your Lord has encompassed mankind (i.e. they are in His Grip)." And We made not the vision which we showed you (O Muhammad as an actual eye-witness and not as a dream on the night of Al-Isra' ) but a trial for mankind, and (likewise) the accursed tree (Zaqqum, mentioned) in the Qur'an. We warn and make them afraid but it only increases them in naught save great disbelief, oppression and disobedience to Allah.

(359) And (remember) when We said to the angels: "Prostrate yourselves unto Adam." They prostrated themselves except Iblis (Satan). He said: "Shall I prostrate myself to one whom You created from clay?"

(360) And when harm touches you upon the sea, those that you call upon vanish from you except Him (Allah Alone). But when He brings you safe to land, you turn away (from Him). And man is ever ungrateful .