Hmm, the right bubble on the last panel is slightly off. That's 'motsu', not 'matsu', but I guess it's kind of a 'How long do you plan to use these tickets', or maybe you could say 'how many of those tickets do you have' - indicating that Yukari has infinite tickets and plans to use them nonstop, forever?

Probably, it's simply that Yukari has had them forever. After all, it is the verb "motsu." So literally, "how long have you had those things?" I'll change it to that for now.

I think its just Yukari being involved, since my guess is that those ticket Chen gave Ran are handmade and I think Ran did the same long ago and Yukari still has them. Kind of like proof of their bond and how Yukari still remembers it.