Same store, same line, same client. On the left, the app as it works today: a wait-time number. On the right, the client gets a fixed arrival time and a leave-by countdown based on how far away they are. Press Start, then try the store events and watch how each side reacts.
Press Start. The client joins the line at 11:00 AM with 11 people ahead and 3 stylists working.
The comparison fills in when the client reaches the chair.