I haven't tried holding onto smaller changes for very long, so I don't know if it'd be a fix like that... [But Akko does furrow her brow in thought to give the idea a little more consideration. Then, plain as day, realization crosses her face.] Ooh! But you could probably get a Witch to enchant something that'd make it go longer with a little less work.

[She bounces a little in place.]

Maybe whoever you're Bonded to could do it? If they're a Witch, I mean.

[No shade or disrespect if he Bonded with another Monster. They just proooobably aren't going to be able to do that kind of magic.]