1 - 2 horas
The lock button was unresponsive for many months and took the device to replace it myself rather than pay triple digits for someone to do it for me.
Was on the verge of peeing my pants at various points, but the guide was very helpful with its well taken and labeled photos.
Have a very organized system to sort the various parts. It also helps tremendously to have the right tools. I didn't have the plastic repair pry tool and was concerned that I was going to break something the whole time.