[erlang-questions] What are the units for erlang:statistics(wall_clock)?

[Roger Lipscombe]

I'm looking to find the uptime of an Erlang node, and I found
erlang:statistics(wall_clock), but the documentation doesn't specify
the units.

I assume milliseconds, but the documentation
(http://www.erlang.org/doc/man/erlang.html#statistics-1) doesn't
specify it, and suggests for other statistics that the units are
subject to change.

(Further the documentation at erldocs.com for erlang:statistics is
kind of messed up (for the R16B03-1 version, anyway...)