>> During is usually followed by a noun. It means 'throughout a period' or 'in the course/middle of' an action or event.

DURING when we want to talk about something that happened: My grandfather was killed during the war. from the beginning to the end of a period of time.

The prepositions For, During, While are often used in time expressions. FOR: For is followed by a length of time ...

FOR is used to indicate a period of time .It answers the question HOW LONG .It can be used with all tenses but often with the present perfect .

For / during / while. petites informations... during = pendant (le moment), on peut demander : quand ? pendant mon voyage for = pendant (la durée),on peut ...