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.
machine - any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks. 1  assembly - a group of machine parts that fit together to form a self-contained unit. 2  bagger - a machine for putting objects or substances into bags.