Welcome to the forum
15 years, wow thats along time you should be amazing by then.
Stolen from Custard a well respescted member and full time cabinet maker
Seems to fit pretty neatly with most makers I know, and also with traditional apprenticeships.
About a 1,000 hours of dedicated application gets you to the stage where you can make most basic, rectilinear hardwood furniture. Say the majority of Shaker style furniture for example.
About 10,000 hours of dedicated application gets you to the stage where you can handle curves, free form laminations, jointed chairs, veneered pieces, and you can make pretty much anything that you can draw.
Beyond that there's a third level of skill (where I'm not but would like to be) where you have the imagination and ingenuity to invent the complex fixtures and jigs required to make things that have never been made before.
We don't tend to use the word craft very often on here, we are wood workers of varying degrees of skill, I'm a master procrastinator and have a nasty habit of starting things and then leaving them unfinished and moving onto the next.
Good Luck and ask away, plenty of skilled folk on here happy to answer questions.