Fit To Time much better than Length

Hi:
I have always Length for reducing short ads like from 40 to 35 seconds for instance, but it never sounded good.
So today, I had a short ad for 34 seconds and needed to reduce it down to 30 seconds.
So I used the Fit To Time, changed to 30 seconds, and click on Stretch as well.
Well guess what, the reduction came out beautifully, as if the announcer just speaks a little faster. Natural and no change in Formant.
dan