On the Tools tab, in the Meetings group, click the Timer arrow.
Click a number to display the timer preset to count down, or click Show Timer and increase the countdown time.
Click
the Start button 
to start the timer.
The Timer feature lets you set a countdown timer for the length of your presentation, brainstorming session, or meeting. The clock lets you see the amount of time left in a subtle way without asking anyone else in the group for reminders or distracting from the presentation, and gives a visual cue when the time is up. You can move the timer display to a convenient location on the screen.
On the Tools tab, in the Meetings group, click the Timer arrow.
Click a number to display the timer preset to count down, or click Show Timer and increase the countdown time.
Click
the Start button
to start the timer.
To reset the timer repeat the steps to start it.
Press the Pause
button, then press Start
when you want to resume.
Do one of the following:
Press
and hold the arrow scroll buttons 
Right-click the timer and select Set time to: then choose a new time.
The following timer options appear when you right-click:
Dock Timer - When selected docks the timer in the upper left corner. To move the timer, uncheck this option and drag it to another location.
Audio Alarm - Select this option to get an audio alarm when the timer is up.
Display Seconds - Turn off this option if you do not wish to see the seconds passing.
Hide Until Five Minute Countdown - This option will hide the timer until five minutes remain. You can re-display the timer at any time: On the Tools tab, in the Meetings group, click Timer.
Display Negative Timer Numbers - If this option is enabled the timer shows a visual cue when time is up but continues the countdown with negative numbers to indicate the elapsed time past 0.
Reset - Stops the timer and resets it to 00:00:00. Use the incremental scroll buttons on the timer or use the Timer command menu to set a new time.
