As Apple holds a memorial on Wednesday at its Cupertino, California campus to honor the life of co-Founder Steve Jobs, the company will close its U.S. retail stores for at least an hour. Employees of several Apple Stores were informed of the closures at a private company event or by phone, The Wall Street Journal reported on Tuesday. The exact duration of the closures is unknown, however one employee told the paper they could last up to three hours. Apple Store employees noted that closings of this kind typically only happen ahead of product launches. Steve Jobs’s funeral was held on October 7th, and a larger memorial event for friends, family, Apple employees and industry executives took place this past Sunday. Tomorrow’s event in Cupertino is for Apple employees only.