Lots of variable here.
Could be as few as 2.
S&W - 1
Poli-Seal - 1
Opti-Seal - 0
Charles
Obviously, that example was extreme, but I can't imagine how I would ever use the number of towels that are being mentioned.
A major detail might take the following.
Bucket Wash - 2 Waffle Weave
One to dry after washing, one for the windows.
Per Glen's instructions, these would not be included in the overall count.
S&W Wash - 1
DP 4 in 1 Wash - 2
One for the first pass, one for the final drying pass.
Paint Correction if needed - 1 or 2
One for SSR 2.5 or Meg's #80, possibly another if I need to follow with a less abrasive polish. Rarely needed.
Paint Polishing/Cleaning/Prep - 1
One to remove Klasse AIO, Poli-Seal or PwS.
I seldom need to do both the correcting and the polishing steps
LSP - 1
Dura Gloss #601 doesn't need to be removed if I am using Dura Gloss and one is all that is needed to remove the DG #105.
Any of the other LSP's I use would require only one for removal.
That's still only 3 to 5 if I don't drop any.
My wheels and tires, and interior are cleaned and treated with some of the many cotton terry towels I still have around.
I do have a mini-van and a mid size car so that might make some difference.
Charles