@kluurs
A few years ago, I went to an estate sale where the individual who passed was a CD collector. It was the first time where I encountered a collection that was comparable - or possibly larger than mine. He also had a large library of books. The house was dark - windows covered - most walls dedicated to shelves for the books and CDs. The deceased owner had been a psychiatrist.
One of the psychiatrists who purchased truckloads of classical CDs, hired someone to come to his home and catalogue his collection of music. It took six months.
As an aside, that same psychiatrist when I met him in 2014 was already on his fourth marriage. I think that by the time I fully retired six years later, that one had ended and he was contemplating that perhaps the marriage thing wasn’t for him after all. Wasn’t too sure though.