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

(501) On the day when their tongues and their hands and their feet testify against them as to what they used to do,

(502) Men whom neither merchandise nor sale beguileth from remembrance of Allah and constancy in prayer and paying to the poor their due; who fear a day when hearts and eyeballs will be overturned;

(503) Or as darkness on a vast, abysmal sea. There covereth him a wave, above which is a wave, above which is a cloud. Layer upon layer of darkness. when he holdeth out his hand he scarce can see it. And he for whom Allah hath not appointed light, for him there is no light.

(504) And when they appeal unto Allah and His messenger to judge between them, lo! a faction of them are averse;

(505) The saying of (all true) believers when they appeal unto Allah and His messenger to judge between them is only that they say: We hear and we obey. And such are the successful.

(506) O ye who believe! Let your slaves, and those of you who have not come to puberty, ask leave of you at three times (before they come into your presence): Before the prayer of dawn, and when ye lay aside your raiment for the heat of noon, and after the prayer of night. Three times of privacy for you. It is no sin for them or for you at other times, when some of you go round attendant upon others (if they come into your presence without leave). Thus Allah maketh clear the revelations for you. Allah is Knower, Wise.

(507) And when the children among you come to puberty then let them ask leave even as those before them used to ask it. Thus Allah maketh clear His revelations for you. Allah is Knower, Wise.

(508) No blame is there upon the blind nor any blame upon the lame nor any blame upon the sick nor on yourselves if ye eat from your houses, or the houses of your fathers, or the houses of your mothers, or the houses of your brothers, or the houses of your sisters, or the houses of your fathers' brothers, or the houses of your fathers' sisters, or the houses of your mothers' brothers, or the houses of your mothers' sisters, or (from that) whereof ye hold the keys, or (from the house) of a friend. No sin shall it be for you whether ye eat together or apart. But when ye enter houses, salute one another with a greeting from Allah, blessed and sweet. Thus Allah maketh clear His revelations for you, that haply ye may understand.

(509) They only are the true believers who believe in Allah and His messenger and, when they are with him on some common errand, go not away until they have asked leave of him. Lo! those who ask leave of thee, those are they who believe in Allah and His messenger. So, if they ask thy leave for some affair of theirs, give leave to whom thou wilt of them, and ask for them forgiveness of Allah. Lo! Allah is Forgiving, Merciful.

(510) Lo! verily unto Allah belongeth whatsoever is in the heavens and the earth. He knoweth your condition. And (He knoweth) the Day when they are returned unto Him so that He may inform them of what they did. Allah is Knower of all things.