Allocating one point into ‘Press the Attack’ should give you a Frenzy duration of 1 second (2 points=2 seconds).
The Frenzy duration however lasts 1 second longer than what is displayed.
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1 point should be 1 second but actually lasts 2 seconds (both buff icon and character sheet).
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2 points should be 2 seconds but actually lasts 3 seconds (both buff icon and character sheet).
From a testing perspective the actual duration would fit way better than the display duration since it allows you to switch between two skills easier and still have the frenzy duration uptime. A 1 second uptime would not feel rewarding enough so i would prefer to see a display change to the current duration rather than nerfing it down to the display duration.