It can vary, but tubes generally are all they will be within 25 to 50 hours. Transformers, big capacitors, etc. take longer. I've been using Decware amps for about 26 years. They usually are "broken in" by 500 to 600 hours. That's about where I am with this new amp.
Not my amp--I don't have a camera and don't do pictures--but this is generally what mine looks like, with that massive transformer and copper plated end caps it looks very nice.
This one has the standard black endcaps on the transformer but shows the padauk wood base and ebony knobs that I have on mine. A beautiful amp.