Long enough, though perhaps not as long as it may have seemed.

[Serious as the injury is, he knows full well that it's not the sort of thing that would have been particularly sustainable for long. Even if she might not have noticed it, in the heat of battle. (Not surprising, really. Even he is no stranger to the sorts of things that might go unheeded during the course of a fight and only noticed after.]

I would be loath to attempt to reattach what was sheered away, however. Though it would not be impossible, there would be great a risk of it remaining fragile. Or worse, the process leaving it forever altered to the point it no longer carries sound correctly.

[Neither of which are fates he means to leave herself too, and though his eyes do - briefly - flick over to Regis, his attention returns to her horn before long, as he works his magicks, stemming the flow of blood before turning to not just the remains of her horn but any deeper injuries besides.

Busy as he is, though, he does not - cannot - spare the effort to create a second pasty when Era finishes the first. Not when the act of Creation requires the whole of his focus, if but for a moment.]

No, better to have it simply regrown. Even if it is like to be the longer process.