Time Stretching
Time stretching is an operation that allows you to change the length of a recording without affecting its pitch.
With time stretching, you can make audio material longer or shorter. This function is most often used to make a section of audio fit in with some other material. You select the material to be stretched and use the options in the Time Stretching dialog to find a stretch factor. This is done by specifying a length or a tempo, according to what the situation requires.