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

(841) That He may forgive you somewhat of your sins and respite you to an appointed term. Lo! the term of Allah, when it cometh, cannot be delayed, if ye but knew.

(842) And lo! whenever I call unto them that Thou mayst pardon them they thrust their fingers in their ears and cover themselves with their garments and persist (in their refusal) and magnify themselves in pride.

(843) when He created you by (divers) stages?

(844) And when we heard the guidance, we believed therein, and whoso believeth in his Lord, he feareth neither loss nor oppression.

(845) And when the slave of Allah stood up in prayer to Him, they crowded on him, almost stifling.

(846) Till (the day) when they shall behold that which they are promised (they may doubt); but then they will know (for certain) who is weaker in allies and less in multitude.

(847) Lo! the vigil of the night is (a time) when impression is more keen and speech more certain.

(848) On the day when the earth and the hills rock, and the hills become a heap of running sand.

(849) For when the trumpet shall sound,

(850) And the night when it withdraweth