i germinated my white rhino seed in 6 days i did it in a jar with dampend cotton wool and put it in a warm dark place i was surprised but the tap root in the end was about 2 or 3 inches long so keep an eye on it if you are gonna plant it in something small if you germinate it in a jar make sure you can see the seed at the side of the jar so you can check it without poking and disturbing it too much ill post a few pics for ya to see
hope this helps