The artists often make large groups of works over an extended period of time. (matthewmarks.com)
Your rights are limited to the license you purchase and you pay a premium for use over an extended period of time or number of uses or formats. (happyselfpublisher.com)
Because progress in most areas of learning occurs over extended periods of time, it is important to be able to track the long - term progress that students make. (teachermagazine.com.au)