Final Cut Pro - Extending a Duration
All generated clips have a default two-minute duration. Here's how to make it longer.
By default, all generated clips have a two-minute duration.
To get "generated" video - renders, still frames, slugs, mattes etc. - to have a duration longer than two minutes, just select the Viewer, press the TAB key (or click in the top left timecode box), and enter the desired duration.
Pressing Tab selects the duration dialog box in the top left corner, where you can type in whatever duration you choose.