The ability to check email on smartphones has extended the work week to 75 hours a week for the US workers, according to new research from Harvard professor Leslie Perlow. The
study revealed that being so attached to email is hurting productivity at work and the general happiness of employees. When Perlow created a test group of people who did not check email for set
period, such as in the evenings after work, she found lower stress levels among them and more enthusiasm among workers when they returned to work the next morning.
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