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

(781) From a drop (of seed) when it is poured forth;

(782) So withdraw from them (O Muhammad) on the day when the Summoner summoneth unto a painful thing.

(783) On the day when they are dragged into the Fire upon their faces (it is said unto them): Feel the touch of hell.

(784) And when the heaven splitteth asunder and becometh rosy like red hide -

(785) when the event befalleth -

(786) when the earth is shaken with a shock

(787) And they used to say: when we are dead and have become dust and bones, shall we then, forsooth, be raised again,

(788) Why, then, when (the soul) cometh up to the throat (of the dying)

(789) What aileth you that ye believe not in Allah, when the messenger calleth you to believe in your Lord, and He hath already made a covenant with you, if ye are believers?

(790) And what aileth you that ye spend not in the way of Allah when unto Allah belongeth the inheritance of the heavens and the earth? Those who spent and fought before the victory are not upon a level (with the rest of you). Such are greater in rank than those who spent and fought afterwards. Unto each hath Allah promised good. And Allah is Informed of what ye do.