Depends how many images you use per location. I generally use 3, but for memorizing the corners of a 3x3 I shove all of the images into one room no matter what. Then edges are probably 2-3 for most people.i would like to point out that japanese is almost golden for auditory memo. i dont use it.
i have a question about journey. typically how many locations are used in a typical 3x3 solve, excluding parity?