Use a stopwatch to time transition events. For concert band rehearsals, use a site like online-stopwatch.com to show the students they have X-number of seconds to be ready after the bell, or you have X-number of time to practice this scale.
For marching band rehearsals, use a stopwatch to time all of your rehearsals. Be consistent about giving students reminders i.e. “Be back in set 5 in 30 seconds.”
Kevin Wood
Cypress Woods High School
Cypress, Texas