Some just know what they're listening for, and if it's not there, they move on. To my ears, you'll pretty much hear 90% of what something is all about(maybe not with fresh speakers) right out of the box.
I recently picked up a "less than 100 hour" phono stage at a fantastic price, considering it's a new model released earlier this year.
It's tubed, and by the sound,(nice, but...) they had exactly 37 hours and 20 minutes.
A month in, they now have 72 hours and 5 minutes. I got impatient and put in the NOS glass-cookin with gas now!