The first 20 minutes: Set your priorities for the day. Forward your phone to voicemail, ignore your email, and keep your schedule clear so you have time to focus and set priorities.
The last 20 minutes: Tie up loose ends. Go through your remaining work and make assignments to employees, forward information to coworkers as necessary, respond to e-mail and voicemail messages, file away the things that you need to keep, and toss the rest. Then, quickly review your appointments for the following day.