FoCal takes me less than 10 minutes per test. I run several tests per lens - distance of 25x and 50x the focal length, zooms tested at both ends and 1-3 intermediate focal lengths (more for higher zoom ratios). I've done my 600/4 bare and with the 1.4xIII; I haven't done it with the 2xIII yet as I need to find a vacant football field...

600 mm plus 2x at 10x focal length is 12 meters or about 40 feet. Perhaps a hallway in a house, definitely hard to find a room that big in my house