1 - 3 heures
Dropped it HARD. Needed replacement. Wasn't sure if I only needed Glass_digitizer or the more expensive part that comes with LCD -- to be on safe side I bought 'with LCD'; I was influenced by ifixit's tip that says if you can't control home buttons/doesn't light up -- get LCD"
Repair was EASY and successful -- with the help of ifixit's video on youtube.
If you are looking for SGH-M919 , then ordering from here is hit-or-miss; I didn't pay attention to the details and received the older model assembly. Also, I'm not sure if you can specify which one you want; I didn't complain because my phone works fine either way. :)