A value-stream map that needs a two-page legend is a poster. Posters are fine in corridors. They are a poor diagnostic. We ask people to walk the route the part walks, or the ticket, and to write only intervals they timed themselves.
Three numbers usually suffice: wait before the station, touch at the station, wait after. If wait-after is “in the system,” go find the physical or digital pile. Piles are shy in meetings and obvious on floors.
Chingshui-area plants often have excellent maps from a kaizen week in 2019. The cell has moved. The map has not. Updating a poster is political; updating a stall log is work. Prefer the log.
When a map is needed for a customer, draw it after the walk, on one page, with dates. If it cannot be argued with, it is branding. Operations consulting that cannot be argued with is not consulting.