-J'aurais donc besoin de partir d'ici vers 4 h du matin.
Could the future simple be used equally here?:
-J'aurai donc besoin de partir d'ici ver 4 h du matin.
Dictation exercise B1
Technically you could, it just sounds a bit more abrupt -
so I will need to leave rather than I would need to leave
but not wrong in my opinion.
Bonne Continuation !
It might sound more abrupt (as Cécile says), but unfortunately I have never been able to hear the difference between the spoken "j'aurai" and "j'aurais". Someone once told me lots of French people pronounce both the same way, but I am not sure if that is correct.
You might be interested in the following discussion on this very subject -
Hope it helps!
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