Very simple, Big 6 Wheel is found near the entrance lobby, down 2 sets of stairs.
to Place Bet on any of the possible outcomes you choose, then
to spin the wheel. Although a very small one, this is a "one sitting" achievement. Bet and spin 10 times in a row without leaving the table (standing up). Losing connection, pressing
to view the menu,
will end the sitting and you will have to start over.
You will very likely get this if you go for: