How often is the function draw called in the initial code snippet?

The function draw is typically called at a rate that allows for smooth animation and responsiveness in graphical applications. In many programming environments, particularly those related to animation and games, a common default is to invoke the draw function every 20 milliseconds. This frequency translates to approximately 50 frames per second (FPS), which is a standard frame rate that balances performance and visual fluidity, making animations appear smooth without putting too much strain on system resources.

This rate is often selected because it provides an effective compromise between performance and visual quality. If the draw function were called more frequently, such as every 10 milliseconds, it could lead to unnecessary CPU load without significantly enhancing the fluidity of the animation to the human eye. Calling the draw function every second would simply not be practical for animation purposes, as it would result in very choppy visuals. Thus, the choice specifying an interval of 20 milliseconds aligns perfectly with the requirements for a responsive and visually appealing experience in graphics programming.