There's no magic formula. It's almost all feel, and it's something that most people (even the biggest proponents of 0 AS) wouldn't recommend to a relative newbie.
Typically, a player sees the majority of his development in his first 1-2 years of pro ball, then some in their 3rd, and in their 4th and 5th seasons is where the "major" improvements tend to stop. With a typical promotion schedule, that's around when you'd start considering them for a spot on the ML roster.
General example: If you have a guy drafted at 18, getting regular promotions without any major injuries or a Diamond in the Rough event, if he's sitting at 24 years old (6th pro season) in AAA and you see 10+ points between Current and Projected, well... he's not getting anywhere close to that.
I guess it's basically a "log curve" for the nerdier types out there.......
That particular graph is a poor example since scale isn't quite right, but that's sort of how it progresses... quickly, then more slowly as time goes on.
1/7/2011 8:07 AM (edited)