A game of football is divided into four periods, known
as quarters, each consisting of 15 minutes of playing
time. The first two periods constitute the first half;
the second two comprise the second half. Between the
halves, a rest period, usually lasting about 15 minutes,
is permitted the players, who may leave the field. The
teams change halves of the field at the end of each
quarter. The clocks stop at the end of each quarter and
at certain other times, when particular events occur or
when designated by the officials. |
