Google said Tuesday it will further cut the amount of time it stores data about users’ search requests, to meet European privacy demands. Peter Fleischer, Google’s global privacy adviser, said the company will reduce the time it stores search information from 18 months to nine. Google introduced an 18-month limit in 2007. The change, which applies to Google’s search Web sites worldwide, “is a significant improvement in privacy terms and it puts us ahead of the rest of the industry,” Fleischer told reporters in a conference call.