A friend of Ardyn's has experienced something similar. A return to her home, the passage of time there while her body here aged accordingly. Then she awoke with more knowledge than she'd fallen into the coma with.

[Cor's voice gets distant, professional. It's easier to speak of such things when it is objective and not about his King.]

If that is the case here he should awaken soon. Though I fear what memories he might gain in that time.