Scale Time scales a block of time, you can scale down to fit into less time or expand it to fill more time.
Scale Time: Selects time and allows you to scale the selection.
Drag to the right within the selection to expand time from the left edge of the selection. All keys to the right of the selection slide right as the selection expands.
Drag to the left within the selection to reduce time towards the left edge of the selection. All keys to the right of the selection slide left as the selection shrinks.
Drag past the left edge of the selection to reverse time and expand it with a negative scale factor. Keys inside the selection, and keys to the right of the selection, can overlap keys to the left of the selection.