The Google Panda 4.2 may take about 10 months to completely roll out. So Why does this update takes much longer than other panda updates. They said it was for technical reasons. What does that technical reasons mean? For a while Google was focusing on the penguin update to get rid of the web spams. Now it shifted the gear towards the quality and engagement. If i am not wrong, the phantom update was also based on the quality of the content. The mobilegeddon update was about the mobile friendly sites. from last year, Google is started to focus on the quality more than ever. This panda update will take deep root towards the quality and engagement.