If "Time/Div" is set to "1mS" for example, it means that 1mS is needed per square for the horizontal movement, i.e. 10mS for moving the beam from left to right of the screen, as the screen is divided into 10 divisions.

For a setting of 1mS, the observer sees an image that seems to be continuous, non-flickering. In long "Time/Div" settings, such as 20mS and 50mS, the movement of the beam becomes visible.
In the simulation, long "Time/Div" settings can only be displayed with some quality restrictions as the calculating  power of Macromedia scripting language "Lingo"  is not enough to perform real-time calculations.

The "Time/Div" control is made up of two controls: The large control points to the values on the face of the instrument. These values are accurate but if you want to adjust the time between the value on the scale and the next higher value, the small control can be turned clockwise.

With the small control (located in the centre of the large control), a fine adjustment can be made. To obtain the values in the face of the CRO, the small control must be rotated fully anti-clockwise until it "clicks."