Different frame rates how long an Animation is going to run by doing calculations for Frames per?

lets see..
you need a starting point. you wouldn't make an animation with one frame per second, but if you did, the frames and seconds would be the same. 60 frames would last one minute. so if it were 10 per second, it would take 600 frames to last one minute. you need variables. use f for frames and s for seconds.
f/s=x