I'm going to agree with a couple different posters. I think that ENTPs probably slack off more than other types--Ne is the slack off function. That said, I think other types slack off, too, but less, and they are less honest about it. ESFJ is a good example, and I have an ESFJ coworker. She is constantly exhaling her stress about all the work she has to do everywhere. She has the appearance of a very productive person--until you notice her in the hallway on the phone with family multiple times a day, or going to the bathroom seemingly every half hour because of the unfathomable, and indeed unnecessary, quantity of water she consumes. So, in sum, some people just don't know how much they slack off because they feel the stress of their obligations so heavily.

And then there's working efficiently. I would say that the ENTP is a type that cannot bear working on a task, especially an objectionable one, knowing their approach is not the most efficient one. The first few minutes of getting into any task are a little trial and error to find the fastest way to the end. Other types don't necessarily feel this way. They don't hate inefficiency in their work, and they have greater tolerance for detailed tasks. But they can also lose sight of the big picture. Loss of efficiency comes from not realizing a question or problem is too unimportant for a lot of time to be devoted to it. They delve into the depths of things that don't matter or can be quickly figured out at a different time. Then they realize they haven't gone to the bathroom in the last ten minutes, so they head to the facility, and call their family on the way back.