Kanban style time tracking in Trello

Time tracking is good but how to track it in Kanban style?

We are glad to let you know that there is a way to do it!

First step is to add the "Kanban" word (without quotes) to the beginning of your doing list name, for example:
- Assignee Kanban Doing
- Kanban Doing

Now if the same user has more than one card in the doing list then whole time is being averaged between all cards/tasks he is working on.