Depending on the complexity of the process and the experience of the participants, it will take app. 3 to 10 days to perform a full Makigami Process Mapping, including a draft implementation plan and ToDo list.

The actual team-based analysis takes some (simple) preparation.

The time consuming part is the preparation for implementation. It takes a good deal of communication to all the involved parties, since the new process ussually is fundamentally different from the old one!

People tend to think in 'tasks' or 'functions', rather than in processes or even systems. Also taking the perspective of value and particularly value to the customer usually needs a paradigm shift that may take a while.

Although major changes can be achieved within 2 or 3 months, the real change of attitude and internalization of 'new behavior' takes at least a year to start with...

And so an ongoing focus of the management is essential. However most management is 'too busy' to keep focused that long...