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In French, there are different ways to express "for + [duration]".
How to express duration in French
Look at these sentences using for + [duration] in English:
As you can see, for + [duration] will be expressed in different ways in French, according to context.
depuis + [durée] = for + [duration]
In all these cases, the action started in the past, but is still ongoing at the time we speak.
In French, you use depuis to express an ongoing duration.
See also Using the present tense (Le Présent) - and not the compound past (Le Passé Composé) - in sentences with "depuis" (since/for) in French (French Prepositions of Time) and more advanced Using the compound past (Le Passé Composé) vs the present (Le Présent) in negative sentences with "depuis" (since/for) in French
(pendant / durant) + [durée] = for/during + [duration]
Note that these cases all express a duration with a clear beginning and end. Whether they take place in the past, present, or future, they are considered as enclosed in a specific timeframe.
In French, you use pendant/durant + [durée], or simply the duration itself, to express a duration with a clear beginning and end.
pour + [durée] = for + [duration]
These sentences all express future durations, with a notion of intent, hence the use of pour.
In French, you use pour + [durée] only to express a duration in the future.
Note that in this context, you can also use pendant/durant + [durée], or simply [durée], as the durations expressed have a beginning and an end:
When using for to express a cause, a reason - because - you will use the word car in French. This for is not followed by a duration like the aforementioned cases.
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