Introducing Simple Lean Coffee Flowchart V1.0, what I have created for describing Lean Coffee to engineers, including myself, and others. This is a simple version of Lean Coffee. There is no dynamic time allocation happening. I will create another one for that reason.
Lean Coffee is a very basic way to manage a discussion, get together and talk about different topics.
If you want to facilitate a meeting, I would suggest you take a look at the Better Meeting Canvas.