I think you misunderstood me, I didn't say anything about when I'm editing the video, I was saying I wanted a real time not a random time, which means I don't want to record maybe 25-46 seconds or cause it's random. 
For instance when playing the game this happens: 
  
After I press F2 and go in and watch my clip this is what I get: 
  
and I wanted to record all of it! 
Get it now? 
DOn't care about the smileys they where just and example.