@DaveB I have always used 12 links and not 24. Is there a reason to do 24 versus 12 links. I can measure 12 links with the chain on the bike where it is under tension.
24 links means I have to remove the chain to measure for wear.
I am of the school where I don't clean my chain. I wipe it down after every ride and lube when it "talks" to me.
Believe it or not, I think you two are using the same length to measure chain wear. 12 inches. 24 pins. 12 full links. Each full link is composed of two half links and two pins. The two half links have an open yoke on one end and the closed end on the other. The open yoke has the plates on the outside, the closed end has the inner plates. But when you add the two halves together, you get the one complete link that is exactly one inch long. And has two pins.