I am doing a full HD render of 2 minutes, just some mp4 GoPro cameras and is taking about an hour to render. All I added was one layer with the logo on a corner (a bug). No color correction or anything. I am using a iMac 3.4 i7 4 cores with 32 GB of ram, flash drive and thunderbold external regular drive. In the activity monitor I am using probably 20% of 3 cores. But damn!!! it is impossible to edit HD in FCP7! I may have to jump to FCPX it seems or Premiere.