It's open long enough for Sora to get a good look at the memory. So long that Sora both gets a chance to read and process more than a few offhand lines and get a very awkward, sick sense that he isn't really supposed to see that. So long that he notices that the soldier probably shouldn't have paused that long, and turns just in time to see them go completely fetal. Okay! They're already sitting! This is fine.

Sora pauses, not really sure what to say, or if he should say anything, but decides to go with short, useful, and true things. "Hi. You're with me. None of that is happening right now."