Reading this and I am still not sure what you want.  A couple of basic questions. 

What are you going to do with the frames (animation) once you make them?

How long do you want to have your frames (animation) shown?

 

Currently I am working on a college project and have a car that is shown to move at 275 MPH (not reality). The sequence is 10 seconds long and I am doing 30 FPS, thus I need 300 frames to show the car moving ~ 4000ft.  The keyframes are put in along the 300 frames to keep the car on track.

Now if I take those 300 frames and play them back at 30FPS I will have an animation that is 10 seconds long.  If I change the playback rate to 60 FPS then my animation will be 5 seconds long.  If I change it to 24 FPS then it will be  12.5 seconds long.  This is in my video editing program, not poser.

Poser can make as many frames as you want, however only you and what your playback device is capable of can make the motion appear to move as fast as you want.  I could tell Poser to use 60 FPS, however it will only make the 300 frames that is in the animation and the frames will be the same either way.

The Frames Per Second in Poser may (probably) has to do with the playback controls to preview what the action will look like.  If I do not have skip frames checked then it will show me each frame even if it takes 1 second per image to update.  However If i have it checked then it will skip however many frames to make the motion come out at the requested FPS.  So if using the above example I play back in Poser then I will see frames 1, 61, 121,181,241 and maybe 300. 

Long story short formulas are

Animation time = Number of Frames / Frames per Second

Number of Frames = Animation Time * Frames per Second

Frames per Second = Number of Frames / Animation Time

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13