difference among GB and BB

Hello
 
I do not know if there is a formal education for anyone of them, from what I understand it is more of a universal understanding for what is what. Here are my beliefs anyway.
 
Typical duration
GreenBelt: 6 days
BlackBelt: 20 days
 
Main difference I think is leadership, As a Blackbelt you probably have more education (included in the belt training) for project management (often referred as soft sigma).
 
For the statistical tools I think they are in basic the same, just that BB gets a deeper understanding due to more training.
 
Saying this a Green Belt may very well have more knowledge and capacity then a BalckBelt if they have good education in leadership and statistics, just that the actual GB diploma doesn’t state that.

For the most part the difference has to do with the level of knowledge for Experiments.

In our company, the first two responses are correct.  I’m a BB and am fully dedicated for the running of our projects.  I work with other plants, R&D and Marketing.  I have a few more tools than our GBs but my understanding is a little deeper because I use them more often.  Our GBs and YBs only work on a couple of projects a year and about 20% of their time when on a project. 
As a BB I’m expected to be a resource for them as well as run my own projects.
 
ZRY