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.
7. (computer science) a register whose contents go through a regular series of states (usually states indicating consecutive integers) 8. a piece of leather forming the back of a shoe or boot. 9. a return punch (especially by a boxer) Familiarity information: COUNTER used as a noun is familiar.