2 - 4 Stunden
Had en extra SSD, decided to use it in my Mac. Couldn't be happier now.
It was much easier than the guide would make it look. No problems at all.
The step for removing the fan: careful there, the guide says you just need to unscrew 2 screws, in my Mac Mini i DID HAVE to unscrew all 3, it wasn't coming out at all with only the 2 pointed in the guide.