Sony FX 6 Quick Start Manual page 145

S & Q: slow motion shooting
When shooting in S & Q for slow motion, the video is captured at a
higher frame rate than the frame rate at which it is played back. The
length of the clip is extended on playback.
For example, if the project frame rate is 29.97 fps (30p) and the S & Q
frame frame rate is 120 fps, the video clip will be four times the length of
what was originally shot. A 3 minute clip shot at 120 fps will play back in
12 minutes as a 29.97 fps video clip.
All of the frames are played back, but at a different speed.