4.1 Authentication only a minor task
The numbers from our observations suggest that authentication only takes a marginal part of the whole interaction
time with an ATM. With 46 seconds on average (or 54.9s when considering preparation and cleanup), more than 90%
of ATM interaction is spent navigating menus and waiting for the withdrawn money (and optional receipts) to appear,
etc. Distractions such as minding bags or talking to friends add further delay.