Her notes devolve into confused scribbles.

After a while he yawns and says, "I think I'm going to eat and sleep, this is going to still take a while. Do you want some food?"

"My sleep schedule is off from yours, but I can try to rest again. And, I understood little of that whole... Book. And, yes to food."

So he rummages inside his backpack and reveals food!

Yay, food! "How much did you have packed for one? Will I need to go hunting?"

"I have a couple of weeks' worth of food here, so unless you eat a lot more or a lot less than me we still have a week." The telepathy effect runs out three words into the sentence, though.

Her side of it doesn't! "Need more mana?"

"Hmm? Well I wouldn't refuse it but I didn't run out, the spell just ended. How're you keeping it up?"

"I sorta - melded with the spell, and was keeping up a mirror image of it, and it suddenly started using more than the tiniest trickle of mana just now so - I guess that makes sense."

"Should I cast it again?"

"Skip it for now. Since you're about to sleep. Mine's more flexible on ending times."

"Okay."

Food food food and eventually he'll sleep.

She attempts to understand her notes for a while, then gets bored and explores out the door that brought Kaede in.

It's a rock tunnel with a slight upwards slope. If she goes far enough she'll find a bifurcation.

She is fast when flying.

She checks for side tunnels along the way and marks the tunnel she came from with a distinctive pock mark blasted into the wall. Then goes left.

She might soon find out this is actually a whole cave system.

Well, she makes a map. And heads back down to the core chamber unerringly after an hour or so and tries to nap.

If the only relevant need is silence and stillness she will succeed at napping in no time.

Yeah, close enough.

Kaede will naturally wake up before she does.

Actually she wakes up when he starts moving and is putting her boots and uniform coat back on before quite realizing that she hasn't been woken in the middle of the night with new orders from some Lieutenant.

"Sleep well?"

"...Well enough."

"I could cast a darkness spell if you still need a while."

"No, I'll be alright. I should adjust to the local sun cycle. But - I went over my notes and had some questions - how well are you understanding this stuff?"