A week ago. Shuji knows things have been strange since a week ago for him too, when he heard that monkey's cry. So that's when this confusion started.

Thankfully, Shuji can read the kanji now, otherwise he'd be all kinds of confused. But that still doesn't immediately give him a picture of what the symbol means and why Togusa's seeing it. He scans Togusa's notes for a few things: talk about people disillusioned with society, possibly criminals. Graffiti. People who are actually handicapped.

If he has to slap Togusa with a paper full of his theories about the connections to get him to go to sleep, so help him, he will do that.