There is a difference in between talking and speaking. I like to parallel it with the difference to hearing and really listening. Talking is relatively easy. It is what we do all day every day to our friends, family, peers, etc. The numbers vary on how many words we speak a day. They very wildly when it compares women to men, most variations stating no citation for their statement. But more importantly than how many words a day we share, is the tone and the timing. Especially if your pay/position is influenced at all by your verbal output.
The following is an interesting article regarding the power of speech and time,