I am getting some new tubes for my amp, and I want to do a 24-hour burn in. How?

OP, just wondering why you want to burn in for 24 hours? What makes you want to do that? Obviously, it's not strictly necessary to do this, and it's ever so easy for people to tell you that, but I'm more interested in what you read or what you're investigating that makes you ask the question.

LOL Go ahead MC tell um when you had your first tube fire, go ahead tell um.. Everyone thinks it's funny until you go threw a few..

It is nice when someone one else does it for you. :-)

I was having 1 in 10 red plate or just not work. They were great valves but you really had to check them. 6V6 from the USSR surplus. 1.50 per valve I picked up 300 close to 30 failed. Great valves.. My Multi Miser was getting a work out.. 

Just so you know, if there is going to be a failure it is usually within 2 minutes of a new valve OR a cold start. They will put quite a light show on in a dim room.. 

I typically go through an upgrade cycle, upgrading most components. Breakin quickly becomes a problem... tubes need a dozen or so hours to get rid of that crisp sound, but good new components require 400-600 hours to sound right. If you buy a new component and want to audition another one... you need the first broken in. If you upgrade five or six components, then interconnects... it is a mess. Most of my equipment sounds good... but not magical until after 150 - 200 hours. I have invested for magic, not just good. I’ve learned about break in for decades... I want to get through it as fast as possible. Life is too short. My last upgrade cycle took over six months, That was fast... because of break in. For various reasons I had to break in three new identical tube amps... I can write a thesis on the sound changes of a breaking in Audio Research Reference 160s. Audio Research puts time on the tubes prior to sale, so there is no obvious “new tube” break in... it is all component break in.

You hit the switch that says "Power", pick out some music and enjoy.

"...1. Connect amp to speakers...2. Plug amp in...3. Turn amp on...There is more? Really???!

Check bias if required.