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I just completed the process.
Three or four feet of tubing is quite adequate.
I fastened the tubing to a ladder away from the paint. Don't get fluid on the paint!
Yes, the tubing can be lowered to allow fluid to drain until new fluid is seen.
Following a gravity bleed, I still had another person pump the brake pedal.
Air came out of the bleeder screw at each caliper.
So, gravity bleeding does a good job of moving fluid quickly through out the brake system but it does not remove all the air.
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