You can pull it up high enough for the strings to bottom out on the fretboard. Did you need more than that for some reason?
Yeah, he's trying to figure out how many notes he can bend UP.
I'm not sure the answer. I should probably know this.
It will all depend on how the guitar is set up, really. And it would only matter if you're fretting at the 24th fret, then pull up, otherwise once the strings bottom out on the fretboard, you're gonna get a whole bunch of nothing.
I've never tested it since I don't use my trem in that extreme of a fashion, but I'm guessing it'll do between one and two full steps up.