I'm not sure how to say something like the following in
The student should speak two thirds (2/3) of the time.
Just going by gut, I would say something
L'étudiant devrait parler les deux tiers du temps.
But this also might be possible or correct:
L'étudiant devrait parler deux tiers du temps.
So do I use the les in front of the fraction parts here or not? Or something else?