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 record for English Language Learners : to write (something) down so that it can be used or seen again in the future : to produce a record of (something) : to show a measurement of (something) : to indicate (something)