The vanity itself was 24" deep, so the wall extended beyond the vanity approximately 8-10" more. I think if you made it anywhere between 32"-36" (depending on your situation and the toilet you're using) you should be okay. Best to confirm once you have your toilet selected so you know overall dimension of that and how far the front edge of the toilet will finish out from the wall so you can conceal it.

you meN THE WALL W GLASS?

so it measures and covers depth of toilet?

Yes, that is correct