I leave a tub running at about 1 gpm on the second floor. At 1 gpm on an 80 gal tub (about average size for most tubs) that would give me 80 minutes if it ever backed up if there was ever an issue. I watch the tub for about 5 minutes to make sure it doesn’t back up while I check the outlets and such. The tub is the first thing I turn on, so I head to the first floor and check for leaks real quick, then head to the basement. After I do the heating unit and water heater, I check on the tub again real quick, and then head back down to do the electric panel (many times I have the agent check it for me). After that I check it again on my way to the attic, and then turn it off when I get back out of the attic.
At least once every 10 inspections or so I find a leak doing this, and I am only running 1 gpm. I have found more plumbing defects than I can count over the years doing that. I do it every inspection. DO NOT do it from a sink… you are just asking for trouble. I also run showers for about 30-60 minutes too - but I watch those much closer. Found one where water came out of a light socket a couple months back from a shower.
It is not in any SOP that I know - it is just what I do. I learned it from another inspector years ago.