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

(771) And in (the tribe of) A'ad (there is a portent) when we sent the fatal wind against them.

(772) And in (the tribe of) Thamud (there is a portent) when it was told them: Take your ease awhile.

(773) On the day when the heaven will heave with (awful) heaving,

(774) The day when they are thrust with a (disdainful) thrust, into the fire of hell

(775) Saying: Lo! of old, when we were with our families, we were ever anxious;

(776) So wait patiently (O Muhammad) for thy Lord's decree, for surely thou art in Our sight; and hymn the praise of thy Lord when thou uprisest,

(777) By the Star when it setteth,

(778) when he was on the uppermost horizon.

(779) when that which shroudeth did enshroud the lote-tree,

(780) Those who avoid enormities of sin and abominations, save the unwilled offences - (for them) lo! thy Lord is of vast mercy. He is Best Aware of you (from the time) when He created you from the earth, and when ye were hidden in the bellies of your mothers. Therefor ascribe not purity unto yourselves. He is Best Aware of him who wardeth off (evil).