Changing the Duration of an Event
Select Edit ® Change duration
Position the mouse cursor on the event block you want to change. To change the starting time for the event, the cursor must be in the left half of the block. To change the ending time, place the cursor in the right half.
Press the left mouse button, and holding it down, move the mouse right or left.
While you do this, a vertical line appears for the edge you are changing. This line connects the edge of the block with the time line above.
When the vertical line touches the desired starting or ending time in the time line, release the mouse button.
The vertical line disappears, and the event block re-appears with its new starting or ending time.