The script is ~55k characters long, depending on the source. This transcript includes who is saying the line, as well as descriptive elements of the story, so the actual ‘words only’ version will be a bit shorter. From what I’ve seen, though, most of transcripts have these non verbal inclusions, so the person who added it to the special instructions likely copied those over as well.

I can’t speak to the other points, but allowing 55k characters is definitely wild.