For countdowns I would use expressions, they work a lot better. First create a new composition that is 3 hours long. Press "Cntl_alt+shif+T" to make a new text layer, twirl open the "Source Text" and "alt + click" the stop watch then copy/paste this expression(courtesy of Dan Ebberts) to count from 6 hours to 3 hours and 1 second.

`rate = -1; `

clockStart = 21600;

function padZero(n){

if (n < 10) return "0" + n else return "" + n

}

clockTime = Math.max(clockStart + rate*(time - inPoint),0);

t = Math.ceil(clockTime);

hr = Math.floor(t/3600);

min = Math.floor((t%3600)/60);

sec = Math.floor(t%60);

padZero(hr) + ":" + padZero(min) + ":" + padZero(sec)

This expression will get you from 3 hours to 1 second.

`rate = -1; `

clockStart = 10800;

function padZero(n){

if (n < 10) return "0" + n else return "" + n

}

clockTime = Math.max(clockStart + rate*(time - inPoint),0);

t = Math.ceil(clockTime);

hr = Math.floor(t/3600);

min = Math.floor((t%3600)/60);

sec = Math.floor(t%60);

padZero(hr) + ":" + padZero(min) + ":" + padZero(sec)

You might have to make up a still image with a time 00:00:00.

You should be able to take both .aep projects and dynamically link them into premiere, put them in the same timeline and stitch them together. Just in case you are confused, here's a project with both countdowns.

6855_countdown.aep.zip
Johnny Cuevas, Editor

Thinkck.com

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."

---THOMAS EDISON on inventing the light bulb.