Hmm - on the SQ series, the chrome ring the lens seats against measures approximately 85 mm from the film plane. With the slight extension of my body cap pinhole adapter, I get a pinhole to film distance of about 90 mm.

But I suspect this may not be the answer to the intended question -- maybe the question is a reference to "eye relief"? Unfortunately, I'm not aware of the answer to that. There are a half dozen different viewfinders, so it might help to know which one, if that has anything to do with the question.

Maybe a quick sketch could bridge the language gap?