Create jump cuts at specified frames
To compress time in a long clip without playing the clip at fast speed, you can create jump cuts to periodically skip over a specific number of frames. For example, if you have a 10-second shot of a person walking down a hallway, rather than playing the entire 10 seconds, you can create jump cuts every two seconds that skip 30 frames each, so the action happens in twice the time.
Speed up a clip with jump cuts
Choose Jump Cut at Markers from the Retime pop-up menu in the toolbar (shown below), and choose a number of frames from the submenu.
You can skip 3, 5, 10, 20, or 30 frames.