Form.
The Timer event occurs for a form at regular intervals as specified by the form’s TimerInterval property.
By running a macro or executing an event procedure when a Timer event occurs, you can control what Microsoft Access does at every timer interval. For example, you might want to requery underlying records or repaint the screen at specified intervals.
The TimerInterval property setting of the form specifies the interval, in milliseconds, between Timer events. The interval can be between 0 and 65,535 milliseconds. Setting the TimerInterval property to 0 prevents the Timer event from occurring.
Timer Function, TimerInterval Property.