… for Apple Final Cut Pro X
Tip #1605: How to Reset a Slomo Clip to Normal
Shift + N is the shortcut to reset clips to 100% speed.
When you need to reset a slow motion clip back to 100% speed, the easiest way to do this is to choose Modify > Retiming > Normal (100%).
This matches the speed of the clip to the frame rate of your project.
You can also use the Retiming menu underneath the Viewer (see screen shot) or the shortcut: Shift + N.