Our business uses the open ticket feature for some of our orders in order to get the kitchen order processed asap. This is usually where the customer is paying by card and could take some time to process payment. We use the default : Ticket - "timestamp" for the Order Number but as you can see it is possible to have the same timestamp for 2 different orders placed in the same minute interval. This is not the case when payment is processed without an open ticket created. In this case a unique order number is created by the system. As an improvment It is requested that the seconds value be included in the open ticket timestamp to differentiate orders processed in the same "minute" period.
I have a gif file showing examples but am unable to load it here