sorry, I didn't know how to make tildes over the letters on my keyboard :D
That is a possibility as it is logical that if we are talking about "hora" (we do not use the word "tiempo" in this context), and hora is a feminine word. It is as if we were omitting the word "hora" when we say:
-¿A qué hora vas a llegar?
-A las 9 [horas].
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