what do you mean by that
That often (if not always) certain things are omitted from the rules to give a chance to more experimentally-inclined users to explore. In this particular case, there is no other public information on training speeds that we know of aside from what other users have been able to infer.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."