"Oh, don't worry, Milliways stops time. You'll get back the exact moment you left."

"Oh, that's convenient." (There is probably some super useful way to use this property. The first thing Jing Yi comes up with is that he could get a drink at whatever time and it wouldn't be noticeable.)

"But if you close the door-- or, um, the window-- then Milliways will go away until the next time it feels like opening the door for you, which could be next week or could be never. --I loaded a bunch of stuff on my smartphone by opening the door and propping it open."

"Well, we'd better try and see how much science I can learn in one hit. ... And I'll also see about getting those books to you."

"Right! To the hotel room! --You have to pay for the hotel room. And food. I'm not using up my book budget on this."

"Oh, I don't know, am I really sure I want to spend money on saving lives? Come on, let's go."

Lev talks to the bar and obtains a hotel room.

The hotel room is done up in the best 2010s style, from the Impressionist paintings on the wall to the television to the minibar. For some unaccountable reason, there is only one bed.

Maybe bed sharing is a cultural thing it would be strange to draw attention to? He can pretend that's how it goes where he comes from, if he has to.

Ooh, look, pretty painting he can stare at instead of the bed. (The painting is impressively bland by 2010s standards. By 8th century standards it's impressively alien.)

"I, uh, guess we can take turns sleeping?"

"If you'd prefer that? Though I'm not sure sleeping in shifts would be efficient. I'm happy to sleep on the floor, seeing as I'm your guest." (Ingratiating himself to this altruistic stranger is worth a sore back and interrupted sleep. And he is happy to play the guest even if he is literally paying for this.)

"If you sleep on the floor you'll be tired and have a harder time learning things."

"If we sleep in shifts, one of us is also going to be tired and have a harder time doing things."

"I guess we can... share? What are the Landlords up to."

"Their ways are truly mysterious."

"We don't have two beds, we do have extra dimensional television."

"I do have to ask-- what is a television? You mentioned them before as well."

Lev flops on the bed and flips on the television. The room instantly fills with moans and what is recognizably people having sex. 

"Uh-- not that one."

The second is some sort of singing competition.

"Oh, so like a smartphone."

"Except with a bigger screen and it only shows videos."

"Bigger, more specialised: got it. Though I'm not sure if this the most useful science, but at least it's entertaining."

"Right, I should probably actually explain useful science."

Useful science! Building up from first principles!

Lev is a phenomenally good teacher.

Jing Yi is a reasonably good student. He tries to steer the topics towards medicine and small scale engineering--he's pretty sure he can convince Leng Yue and Xiao Jinyu to give some things in those realms a go.

Lev can do medicine and small scale engineering!

Bounce bounce bounce what does Jing Yi think the solution to this problem is