On Tue, 28 Dec 2010 22:45:13 +1100
Neil Brown [off-list ref] wrote:

If anyone has any data on default spin-down times of these "green" drives I
would be keen to hear about it.

According to many sources, the factory default on WD Green is 8 seconds:
https://encrypted.google.com/search?hl=en&q=wd+load+unload+factory+default+seconds

-- 
With respect,
Roman