Morning.
5 chakra elements are not impossible to get. Is just that it will take a lifetime to obtain it. An average person can only have one, above average is two and totally above average is three or even four. Five is the superior point.

Then again I'm refraining from this route because i want you guys to earn by hardwork.

As for progression.
Prodigies are not even halfway in their potential as of now. But they will progress but slower than a turtle.

Non prodigies gets to progress faster but not rapid yet it will take lots of effort to reach the prodigy's level.

Prodigies are at least Shippuden Sasuke(The one that fought Deidara) level.