The answer to that is 21 days exactly, although you need to bear in mind that this can vary, depending on a number of circumstances. Generally speaking however, fertile chicken eggs which are hatched out by a hen will take 21 days before you see little faces staring at you from underneath their mamma's wings.
In linguistics, a register is a variety of a language used for a particular purpose or in a particular social setting.
representative - an item of information that is typical of a class or group; this patient provides a typical example of the syndrome; there is an example on page 10. example, instance, illustration. information - knowledge acquired through study or experience or instruction.