3 verses have
“when”
in Edition Clear Qur'an by Talal Itani / Ad-Dukhaan (The Smoke)
44:10So watch out for the Day when the sky produces a visible smoke.
44:16The Day when We launch the Great Assault—We will avenge.
44:41The Day when no friend will avail a friend in any way, and they will not be helped.
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274