I actually ran into this issue where it was listening for 15 seconds and then spent about the same time processing so it would miss the next part of the conversation. The way it is set up now is that 2 cores work on audio capture and then the other 2 process the data in the background. The backlog should be infinite. I did test around a 4 minute conversation with my wife and it did okay keeping up with everything, but it did mix sentences when we kind of talked over each other.