I make extract with steeping grain/mini mash brews when I'm pressed for time.
I heat up water for the steeping grains and at the same time get about a gallon of water boiling for the hops.
I let the steeping grains sit for about an 45 minutes or an hour or so, then pull the grain bag and stir in the extract.
I heat it up to about 180 and let it sit for at least 15 minutes. I've read that you really only need to hold the temp at 150F or so, but I go a little higher. Sometimes I'll toss some late addition hops in when it gets to 180.
So the whole "brew day" is about an hour and 15 minutes.
I only boil a portion of the brewing water with the hops, there's no need to boil the whole thing. I'm using my kitchen stove, so there's less waiting to get the big kettle boiling.
Doing this you're supposed to make some adjustments because you are boiling the hops in plain water, but I haven't had any problems following the recipes as they are.
I set the brew kettle and the smaller pot with the hops out on the back porch and in the morning, dump them in the fermenter.
The coopers extract already has hops in it so you don't need to boil that all.
I once tried using some pre-hopped extract that came with a Mr. Beer fermenter I bought on line, and I really didn't like the taste, however the extract was old, out of date.
So yeah, you can get the pre-hopped extract and throw a brew together really fast, but I prefer to take a little extra time, use some steeping grain and boil some hops in an effort to obscure the extract flavor.