1 - 3 hours
No touch response to bottom 1/3 of screen.
I had an iPhone 4 CDMA (Verizon), the bottom of the screen (where you swipe to unlock) would no longer respond to touch. Ordered new screen (screen and digitizer are attached to each other), and followed the guide. I would suggest looking at the sub-pictures for each step (especially 36), they include helpful and important info.
I left the following comment on Step 17 about an "extra" rubber piece that fell out during reassembly:
"There's a little rubber piece that you can see in the Step 17 & Step 21 pictures just above the yellow sticker. It fits over the edge of the board where the two ribbon cables from the display/digitizer come up through the board (Step 36). It's there to make sure the ribbon cables don't rub against the sharp edge of the board. This piece loves to fall out when pulling the logic board off. Make sure to put it back in when routing the cables in Step 36, thin edge on the bottom, thicker edge on the top."
Take your time, be careful with all the ribbon cables. Pay attention to the main picture and sub pictures of each step.