In my experience on committees of the whole, when a member has very little time left, they can use almost all of it to make a comment if they so wish.
When the member ends their remarks with a question, the chair indicates how much time is left for the answer and asks for a brief response.
The member chooses whether they wish to make a comment or not. If that is how they decide to use their time, they clearly aren't looking for an actual answer.
That's how committees of the whole work. The precedents are quite clear and significant when it comes to how this works.