My 3 year old dropped my iPad on a tile floor and shattered the display.
The actual repair took about 15-20 mins. The longest part of the repair was just getting the shattered glass off. I tried the iRepair bag, but that was taking forever. I used a blow dryer and that sped things up considerably.
Use a blow dryer and be extremely careful with the LCD. Before glueing the new display down turn the device on to make sure everything is connected properly.