Including preliminary work (work with the spatula) it took about 3 hours until I had the wall sticker attached. Unlike another Wall Decal that of a third-party was and was 3 times as large, I have only a slim 3/4 hour hand. The problem was that the tattoo in some places even at delivery had slight creases and despite intensive preparations did not want to adhere to the wall later. Now have the corners simply glued to the wall and press on anyway daily passing the wall tattoo at some points firmly.
Commendable was the fast delivery and the clear description.
Error of mine was at that: I have the tattoo ordered in white to install it on a darker wall to make the image wirgt now like a negative and no longer looks like intentional.