At worst 18' 6". At best 19' 11.99999999999999".
20 feet
For the ceiling that your looking for would be cement
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You can buy clips that attach to the spreader bars on the recessed light itself, then the clips attach to the suspended ceiling bars. You may need to add a pair of additional suspended ceiling bars to make this work. Armored cable should be run to energize the light.
Attach the rope to the hook on the ceiling, attach the magnet, attach a cannon ball, then swing it at the door. You need to do it three times. Good luck!
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There should be a small loop on the back of your harness, that is where you should attach the belt. The belt usually comes with a chalk bag, but not always. They can be on average about $4.00. When you are climbing, reach backwards and stick your hand in the bag. It will help you keep your grip.
Chalk Bags are associated with the sport of Climbing. This is because they have a drawstring system where it's really easy to fit lots of stuff in them - they also have dedicated climbing latches where you can attach climbing equipment such as Caribenas.
tendril
The fly makes contact with the ceiling with its front legs. Using the momentum from flying, it swings the rest of its body and it's legs attach to the ceiling.
You will have to point your A/C blades towards the ceiling. Nothing else can be done in this regard.
Take a hook like a command strip, screw it, tape it, or somehow atatch it to the ceiling, then peel tiny strip of the banana and screw the it through the hook
The ceiling grid is not going to help all that much. not on that long a wall. How far above the ceiling is the roof and is there something there that a brace could be attached to? A V brace every so often or do the wall in sections with a longer stud between each section that extended to the roof structure.