Track View > Curve Editor or Dope Sheet > Track View toolbar > Scale Keys
Track View > Curve Editor or Dope Sheet > Keys menu > Scale Keys - Time
Scale Keys - Time moves all selected keys proportionally toward or away from the current frame. Use the Scale Keys button in either mode to change the location and amount of time covered by one or more selected keys.
The scale center is defined by the current time set by the time slider. You can scale keys about any moment in time by dragging the time slider before you use Scale Keys.
To use Scale Keys:
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Select an animated object in the viewport, then right-click and choose Curve Editor.
The following steps work in either Curve Editor or Dope Sheet modes.
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Drag the time slider to the time you want to use as the scale center.
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Click Scale Keys or from the Keys menu choose Scale Keys - Time.
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Drag to scale the selected keys or press and hold Shift and drag to add scaled copies of the selected keys.
Drag away from or toward the current time line for the following results:
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Dragging away expands the keys from the current time. Expanding the selection increases time between the selected keys and slows that part of the animation.
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Dragging toward shrinks the keys toward the current time. Shrinking the selection reduces time between the selected keys and accelerates that part of the animation.
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Dragging through the current time reverses the keys and expands the keys away from the current time.
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Tip: You can type-in the Scale Value using the first field in the Key Stats: Track View toolbar.
The scale percentage is displayed in the Show Selected Key Stats field as you drag the selection.