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 for English Language Learners. : 1  a person who sees something (such as a crime) happen. 2  law : a person who makes a statement in a court about what he or she knows or has seen. : 3  a person who is present at an event (such as a wedding) and can say that it happened.