I started on my first true high end system not too long after I got my first professional job after college. I think I spent at least two - three years getting my first system put together. There was a lot of swapping, as this component or that would not really do it. Incessant reading and trying to get the lay of the land. I took out my first loan to buy a Threshold s500 amp ($5K…. $19K in todays dollars). That became my first “permanent piece”.
That held me for about ten years until I got out af graduate school and got a job. Then maybe a year and a half upgrading my system to the next level. Including probably 500 hours into evaluating cables… how they differed etc.
Next cycle took less than a year. Next about a year.
This last one after I retired… the choice of components really quick, wires quick, then about a year of slow methodical positioning, vibration control, and room treatments.