Of all the things that get in the way of doing work, US marketers say that excessive email is just about the worst, according to July 2015 research.

Almost two-thirds of US marketers polled in a July 2015 survey by Workfront and The Harris Poll said that the only thing impeding their work more than excessive email was wasteful meetings, including those which were not engaging or inefficient.

Nearly half of respondents said excessive oversight, such as needing too many approvals, and lack of standard processes for workflow also got in the way of their work. Other practices that hindered productivity included a lack of collaboration within their team, client hand-holding and excessive delegation from their boss or manager.

It’s not surprising that marketers should find email frustrating. July 2015 research from Adobe revealed that US business executives spend an average of 3.2 hours daily—on weekdays only—checking work email. And they also spend almost as much time, an average of 3.1 hours a day, checking personal email.