Hi Neil,
It's measured in half staff-spaces, so the default length is 7 (i.e., 3.5
> staff-spaces).
Quite apart from the height estimation, what is the supposed correct semantics of 'length anyway? It looks like it's interpreted as the distance between the end of the stem and the midline?? (This is the second part of the bug I am describing in the original "Description" field of 1056). Here is a very good example, courtesy of Jiri Zurek, that shows what I am talking about:
\version "2.12.2" \relative c' { \override Staff.Stem #'length = #0 c4 d e f g a b c d e f }
zeroLengthStem.pdf
Description: Adobe PDF document
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