'We only get one life. Wasting someone’s time is the subtlest form of murder.'
You're a people person?
They're your most valuable resource?
You're a Leader?
Respect people's time.
Start on time.
Finish on time.
Make any interruption worth the 25 minutes they'll take to refocus.
Lead them by example to respect time.
Thank you for your time. Sincerely.