This is useful for columns of data. This speeds up data entry and allows the user to override the default to enter other data when necessary. Another benefit is that the defaults can keep data fields from being null values. Either a string expression or string variable can be used for the default value. There are often times when the input data needs to be validated.
Dates are a good example.
The time limit is a real number interpreted in seconds. The clock starts running after the input prompt has been displayed on the screen and stops when all of the input variables have values. This option is especially useful for applications such as a typing tutorial. There are other ways to input data which assist the user and also provide some input error control. Fill-in fields can be used to show the user what data to input and also cut down on input keystrokes.