This article is from the Drum corps FAQ, by Cathy Doser firstname.lastname@example.org with numerous contributions by others.
Each corps' performance is supposed to last between 10 and 11 1/2
minutes. There is a 0.1 point penalty for each 6 seconds above or below
these limits. A typical show consisting of 7 corps will last about three
hours. Usually, the winner of the show will do an encore performance while
standing still (i.e. not marching). These kinds of performances are
known as standstill performances.