Is it the beer or do speakers/electronics really need some extended warm-up period?

I don't drink either. Well, I sometimes do but under different circumstances.
Two hours of warming up, after that I don't hear a difference. And I mean not playing anything for two hours. If playing, I can't be certain but I think it improves up to one hour. Mid-level solid state electronics, dynamic speakers, MM cartridge.

Time to play "March of the Self-Confident Audiophile"! 

Sorry, guys, you are wrong. You're living in a fantasy where you can purportedly distinguish between warm up and burn in, and can hear equipment changing in sonics over hours or days. It's great for the ego, not so good for building superior audio systems. :( 

Isn't it reasonable to find that components operate best once they have achieved thermal equilibrium. 

I have experienced that all my systems sound better after 1/2 - 1 hour of operation.  

douglas_schroeder
Time to play "March of the Self-Confident Audiophile"!

Sorry, guys, you are wrong. You’re living in a fantasy where you can purportedly distinguish between warm up and burn in, and can hear equipment changing in sonics over hours or days. It’s great for the ego, not so good for building superior audio systems. :(

>>>>>>Uh, from what I can tell nobody actually claimed he can distinguish between warm up and burn in. I mean other that one person might have used the term "burn in" uh, inappropriately. I say we give him an audio grammar violation flag. 🇨🇺

It's beer belly that grows bigger of a beer-audio-lover that really can act like channel separator between speakers