My opinion is that it doesn't really work like this. It is more like, if you're eventually going to reach this rating, you are probably this strong after so many years of playing seriously. So after playing 10 years the person who is going to peak at World Champion is probably already a GM. The person who is going to peak at expert, may still be a class A, but probably is close to Class A or Expert after that time.
Always wonder how long it takes to become GM, IM, FM etc.. I'll tell you

You have to distinguish if you are a kid, a teen or an adult. Because you can multiply your given efforts by x1, by x10 or by x100.
I wrote this in another forum:
"Personal note: I have been playing chess for 30 years. I have a good memory and I am not lacking talent. I devoted some 10.000h to chess amongs other things. I had trainers, was trainer myself and read say 50 books. My national rating index is "217" means 217 otb tournaments.
Starting at 16 achieving "CM" was somewhat the maximum I could gain. I think FM would have been possible but having/making a good job is also not bad. ;-) "
You have to distinguish if you are a kid, a teen or an adult. Because you can multiply your given efforts by x1, by x10 or by x100.
I wrote this in another forum:
"Personal note: I have been playing chess for 30 years. I have a good memory and I am not lacking talent. I devoted some 10.000h to chess amongs other things. I had trainers, was trainer myself and read say 50 books. My national rating index is "217" means 217 otb tournaments.
Starting at 16 achieving "CM" was somewhat the maximum I could gain. I think FM would have been possible but having/making a good job is also not bad. ;-) "
You're generalizing based on your maximum achievement. There are many who start playing chess as kids and never make it past CM. In fact, there are more kids who will never get a title at all than those who will.

You have to distinguish if you are a kid, a teen or an adult. Because you can multiply your given efforts by x1, by x10 or by x100.
I wrote this in another forum:
"Personal note: I have been playing chess for 30 years. I have a good memory and I am not lacking talent. I devoted some 10.000h to chess amongs other things. I had trainers, was trainer myself and read say 50 books. My national rating index is "217" means 217 otb tournaments.
Starting at 16 achieving "CM" was somewhat the maximum I could gain. I think FM would have been possible but having/making a good job is also not bad. ;-) "
You're generalizing based on your maximum achievement. There are many who start playing chess as kids and never make it past CM. In fact, there are more kids who will never get a title at all than those who will.
I started a the age of 16 by the way. And because you asked, I have seen thousands of players and trained not few of them.

Most people will plateau and quit, you can only improve if you study correctly (which few are willing to do)

It depends a lot on your age and innate (?) talent.
Indian GM Praggnanandhaa cannot possibly have trained in chess for 15-20 years.
A gifted kid will reach titles in a couple years, even months. A grown up, never.

It depends a lot on your age and innate (?) talent.
Indian GM Praggnanandhaa cannot possibly have trained in chess for 15-20 years.
A gifted kid will reach titles in a couple years, even months. A grown up, never.
There has to be a reason why a person who started as a grown-up can never be titled, right? I hate it when people don't state the reason why. I know that opinion is absolute BS.
You're welcome to provide as many examples of people who started chess past 25 and reached FM (the lowest title, about FIDE 2300) as you wish.
It depends a lot on your age and innate (?) talent.
Indian GM Praggnanandhaa cannot possibly have trained in chess for 15-20 years.
A gifted kid will reach titles in a couple years, even months. A grown up, never.
There has to be a reason why a person who started as a grown-up can never be titled, right? I hate it when people don't state the reason why. I know that opinion is absolute BS.
You're welcome to provide as many examples of people who started chess past 25 and reached FM (the lowest title, about FIDE 2300) as you wish.
Chigorin started playing chess later than usual, according to Wikipedia. I didn't check exactly how old he was, though.

It depends a lot on your age and innate (?) talent.
Indian GM Praggnanandhaa cannot possibly have trained in chess for 15-20 years.
A gifted kid will reach titles in a couple years, even months. A grown up, never.
Exactly Praggnanandhaa is a speacial case, so is Magnus and few other GM'S.
My time line is only rough estimate for people who have no idea AT ALL ! some think they can become titled players in 1 year time some think they can be a GM after 2 years time.

It depends a lot on your age and innate (?) talent.
Indian GM Praggnanandhaa cannot possibly have trained in chess for 15-20 years.
A gifted kid will reach titles in a couple years, even months. A grown up, never.
There has to be a reason why a person who started as a grown-up can never be titled, right? I hate it when people don't state the reason why. I know that opinion is absolute BS.
Well, here's my take on why: https://www.chess.com/blog/usernamesaregone/so-youre-brand-new-but-want-to-make-gm

My time line is only rough estimate for people who have no idea AT ALL ! some think they can become titled players in 1 year time some think they can be a GM after 2 years time.

There has to be a reason why a person who started as a grown-up can never be titled, right? I hate it when people don't state the reason why. I know that opinion is absolute BS.
Brain plasticity... the ability of a Human brain to modify its own structure and form new interconnections in response to new data... is severely reduced after childhood.
"BENJAMIN FINEGOLD (born Sep-06-1969 ...) ... Ben became a USCF Life Master at 15, USCF Senior Master at 16, an International Master in 1989, and achieved his final GM norm at the SPICE Cup B Section in September, 2009. ..."
"MARK IZRAILOVICH DVORETSKY (... died Sep-26-2016 ...) ... He was ... awarded the IM title in 1975. Dvoretsky was also a FIDE Senior Trainer and noted author. ... During the 1970s, Mark was widely regarded by the strongest IM in the world, ..."
So this is a rough estimate for people who have no idea at all, how long does it take to become each of the following. (Of course it may vary depends on many factors including age, memory capacity, genetics etc).
Expert - ~2000 [ 4,5 years]
CM OR NM - 2200 [ 7 years ]
FM - 2300 [ 9 years ]
IM -2400 [ 12, 13 years ]
GM - 2500 [ 15, 20 years ]
Time line is if you starting chess from scratch and work your hardest to grow as fast as you can.