The word(s) "when" appears 1006 time(s) in 918 verse(s) in Quran in Muhammad Pickthal translation.

(201) Who doeth greater wrong than he who inventeth a lie concerning Allah or denieth Our tokens. (For such) their appointed portion of the Book (of destiny) reacheth them till, when Our messengers come to gather them, they say: Where (now) is that to which ye cried beside Allah? They say: They have departed from us. And they testify against themselves that they were disbelievers.

(202) He saith: Enter into the Fire among nations of the jinn and humankind who passed away before you. Every time a nation entereth, it curseth its sister (nation) till, when they have all been made to follow one another thither, the last of them saith unto the first of them: Our Lord! These led us astray, so give them double torment of the Fire. He saith: For each one there is double (torment), but ye know not.

(203) And when their eyes are turned toward the dwellers of the Fire, they say: Our Lord! Place us not with the wrong-doing folk.

(204) Await they aught save the fulfilment thereof? On the day when the fulfilment thereof cometh, those who were before forgetful thereof will say: The messengers of our Lord did bring the Truth! Have we any intercessors, that they may intercede for us? Or can we be returned (to life on earth), that we may act otherwise than we used to act? They have lost their souls, and that which they devised hath failed them.

(205) And He it is Who sendeth the winds as tidings heralding His mercy, till, when they bear a cloud heavy (with rain), We lead it to a dead land, and then cause water to descend thereon and thereby bring forth fruits of every kind. Thus bring We forth the dead. Haply ye may remember.

(206) And Lot! (Remember) when he said unto his folk: Will ye commit abomination such as no creature ever did before you?

(207) Lurk not on every road to threaten (wayfarers), and to turn away from Allah's path him who believeth in Him, and to seek to make it crooked. And remember, when ye were but few, how He did multiply you. And see the nature of the consequence for the corrupters!

(208) Then changed We the evil plight for good till they grew affluent and said: Tribulation and distress did touch our fathers. Then We seized them unawares, when they perceived not.

(209) He said: Throw! And when they threw they cast a spell upon the people's eyes, and overawed them, and produced a mighty spell.

(210) Thou takest vengeance on us only forasmuch as we believed the tokens of our Lord when they came unto us. Our Lord! Vouchsafe unto us steadfastness and make us die as men who have surrendered (unto Thee).