I only had to replace one earcup, and it took between 5 and 8 minutes. They’re not completely flat. There were no issues plugging it into my phone which has a thick case. It is a paradox, but all my foot problemswhich I have had with heavily padded shoes went away after starting to run with zero-drop running shoes. I have another one I received after surgery and it was very uncomfortable and created bumps on the creases of my arm. I charged it up and popped it on. Came on time, but the box was a mess. Muy cómodos y a la medida Will probably return or exchange. For those who dont know, this is a 10 mile hike and I was carrying a 30 pound pack.