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Three keyframes with three different states : Normal, Selected and Deactivated

You can adjust the Time of a keyframe by a normal drag and drop. To adjust it's Length, hold Alt key when releasing the mouse button.

During a keyframe drag and drop operation a tooltip indicator will be displayed with some time informations.

Right click over a keyframe or in upper part of the "Timebar" open the keyframe contextual menu giving access to the keyframes actions.