With me being just a trucker, you know much more about the calculations concerning how much time is required to get six gallons of water at room temperature (assume 72 degrees) to boiling at 204 degrees (at my altitude of 4150 feet ASL). I once timed the time-to-boil for three gallons at 52 degrees to boiling: 98 minutes. I used my aluminum flame-tamer, which I really do believe speeds boiling because it spreads the heat over the entire 95 square inches of the bottom of the kettle. I suppose I could set the water over the lowest flame at 2300 hrs, thus having it dam-ned hot or even gently boiling at 0800 hrs when I fall out of the rack. The top would be in place, so I'm guessing not too much evaporation. I drilled a 3/8-inch hole in the top to help avoid a boil-over. FermCaps-S is really good for that, too.
I'm just a simple extract brewer. I'll never become an all-grain brewer; takes far too much time. Part of the application process to drive for FedEx Ground is to swear on any of Charlie Papazian's books that homebrewing shall take a distant backseat to a load that has to roll today-- like right now! Looking back at my various records, I have not made any beer since April 2021. So disheartening...
I have read several times that the plastic used for translucent fermenters (like BrewDemon's 2-gallon conical) cannot tolerate wort of more than 140 degrees. I wondered what is the melting point of HDPE, such as for the 5-gallon buckets we all know and love. It's 248 degrees, so just-boiled wort can go straight from the kettle to the fermenter. I'm thinking the plastic will shed the heat faster than will the stainless steel, and we always have cold-water baths to get there sooner.