Three-vessel brewing: hot liquor tank, mash tun, brew kettle.
OK. Had no idea, what with not being an all-grain brewist...
You don't really need three vessels, biab requires 1, and I've done it for decades with only two. A kettle and a mash tun. I put the heated strike water and grain into the mash tun and heat the sparge water in the kettle. I sparge into a six and a half gallon bucket till I can get all the sparge water into the mash tun and then dump the bucket into the kettle again. I don't have a sculpture and I have never used pumps.
I would say extract saves about an hour and a half, but if you're steeping a bunch of grains, that time is even a little less. And this post wouldn't be complete without recommending you try biab at least once. You can try it with literally nothing other than a bag, the cost of which is immediately offset, at least in part, by the savings on the malt.