Warm-up time for Cummins Diesel

Ya, right.

That should do the trick, unless it is extreme cold.

Does you neighbor have the high idle deal?

For the most part, accurate. Extreme conditions will dictate otherwise, but it sounds like you don't need to concern yourself with sub-zero temperatures.

That's fine... rule of thumb is to start it up, wait 'til you've got oil pressure, then drive it gently until you see the temperature gauge moving. No "foot to the floor" driving until that temp gauge is registering... worst thing you can do to a diesel (other than run it without oil, of course) is to feed it a lot of fuel while it's cold.

Not necessary - unless you're waiting for the frost on your windshield to melt :)

I find that some winter inserts for the grill, or a grill cover, help with warm-up times. You'll get cab heat more quickly that way. Normal driving wouldn't overheat the engine, but if you go to pull a heavy load, you might want to pop some of the inserts out, or open up the cover a little more.

With a diesel you would be hard pressed to be a block heater or a tank style unit in the heater line. Warm engine, and in most instances clear windshield and warmer cab to boot. If you don't like the cord out the grill look wire it into a shore power connector such as those used on boats. Then you just have a flip up cover. You could also connect up a small battery tender as well. I have my 97 Blazer set up that way. That way when the alarm bell goes for a fire/EMS call I just jump in and go.

Plug in the block heater and you won't have to worry about warm up.