How many days will it take to learn BIM?

I'm curious, how long does one typically need to dedicate to learning BIM? Is it a matter of weeks, months, or even years? Are there any prerequisites or foundational skills that need to be in place before embarking on this journey? Additionally, what resources or learning platforms would you recommend for someone looking to acquire this skillset? Understanding the time commitment and the path to proficiency is crucial for me to plan my learning journey effectively.