I meant to say that the last two marks indicate coats on my 09 ext cab Silverado. That's how little you need.
I also washed my Wifes Accord two weeks ago when we had a warm day as cold weather was in the long term future and I figured it would stay relatively clean for a while. I ended up giving it a thorough wash, one coat of Z2, and one coat of ZCS. This car was fully detailed back in May when new and after this application it looks perfect again. The durability of Z products is fantastic.