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

(421) And (bethink you of) the Day when we remove the hills and ye see the earth emerging, and We gather them together so as to leave not one of them behind.

(422) And (remember) when We said unto the angels: Fall prostrate before Adam, and they fell prostrate, all save Iblis. He was of the jinn, so he rebelled against his Lord's command. Will ye choose him and his seed for your protecting friends instead of Me, when they are an enemy unto you? Calamitous is the exchange for evil-doers.

(423) And (be mindful of) the Day when He will say: Call those partners of Mine whom ye pretended. Then they will cry unto them, but they will not hear their prayer, and We shall set a gulf of doom between them.

(424) And naught hindereth mankind from believing when the guidance cometh unto them, and from asking forgiveness of their Lord unless (it be that they wish) that the judgment of the men of old should come upon them or (that) they should be confronted with the Doom.

(425) And (all) those townships! We destroyed them when they did wrong, and We appointed a fixed time for their destruction.

(426) And when Moses said unto his servant: I will not give up until I reach the point where the two rivers meet, though I march on for ages.

(427) And when they reached the point where the two met, they forgot their fish, and it took its way into the waters, being free.

(428) And when they had gone further, he said unto his servant: Bring us our breakfast. Verily we have found fatigue in this our journey.

(429) He said: Didst thou see, when we took refuge on the rock, and I forgot the fish - and none but Satan caused me to forget to mention it - it took its way into the waters by a marvel.

(430) So they twain set out till, when they were in the ship, he made a hole therein. (Moses) said: Hast thou made a hole therein to drown the folk thereof? Thou verily hast done a dreadful thing.