Doing things in moderation would benefit the fire demon's progress, but it's hardly a shock to find that even in this, he's incapable. Kurama might admit to just how surprised he is by the effort Hiei has actually been putting in through everything, all things considered. If it did come up, that is. That would require talking about it, though. Instead, he simply watches as the fire apparition finishes off the tea in one go, frowning slightly with the question that follows.

“Hard to say. The circumstances are unprecedented, as I've said before, and your unique situation only further complicates any attempt at prediction. You've improved a bit since the first dose, for one, which will alter the effectiveness. That's all without factoring in that, on top of all this, tonight's specific brew is an entirely new combination of ingredients.”

Your guess is as good as his, Hiei.