iMovie 08 - Extending picture duration to match lengthy narration?

Hi, everyone. I'm working on a project, and it's my first time using iMovie 08. I need to extend my pictures' durations to match lengthy monologues being recorded in GarageBand. However, when I type "2:00" it is read as 2 seconds and "2:00:00" is 1.01 seconds. I need to make the pictures last the full time as the narration. I at least need the full narrations. What should I do?

*Bump sorry guys but this is rather important that I get an answer to this rapidly.

If it's 2 minutes you want try 120 (seconds).

I tried that already and it didn't work. I think there is a limit to how large of a time duration you can set. So, I worked around it by setting the highest time I could get to work and just copying and pasting the image a few times. It's not perfect, but it worked.

If anyone has a permanent, better solution to this problem, please contribute. Thanks!