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.
Definition of Witness. What is a Witness. In legal matters, a witness is an individual who has knowledge relevant to the case, but may also be someone who claims to have, or who is thought by others to have, such knowledge.