Musar על ערכין 30:11

And, especially, one who scrutinizes carefully the introduction to the Chafetz Chaim, and, the first two gates of all of its chapters will see that in fulfillment of the trait of guarding his tongue there will be deducted from him every year several hundreds and thousands of sins and added to him in exchange many hundreds and thousands of mitzvoth. For even if there only be deducted from him through this ten words of improper speech each day, that he has muzzled his mouth from speaking, it would still amount to over three thousand per year (And in this way I have explained what Chazal have said (Arachin 15b): "All who speak lashon hara increase sins until the heavens," the meaning being that if one is habituated to this sin, then from this itself his sins increase greatly), and those [muzzled] words would be reckoned as mitzvoth for him in the world to come. As Chazal have said (Makkoth 23b): "If a man sits [idle] and does not commit a sin, he is rewarded as one who has done a mitzvah, and, for every moment that he muzzles his mouth, etc." And he will also arrive, as a matter of course, at many holy traits, as I have written in the Second Gate of this work.

And we can say that apparently "All who speak lashon hara" applies to one who is habituated to it and does not take it upon himself to guard himself against it. And there is always someone who finds someone to speak about every day. And even if we do not reckon many words, but only four or five a day, that is, about thirty words a week, and, in the course of a year, about fifteen hundred words, even if we consider lashon hara only one negative commandment, [he violates] fifteen hundred negative commandments a year! For certainly, just as in words of holiness, every word in itself is [fulfillment of] a positive commandment, so, in forbidden speech, every word is an issur in itself. And if he conducts himself in this manner his whole life, he accumulates about eighty thousand or more. And it is known that from every transgression a "prosecutor" is created, as we find in Avoth 4:11: "Anyone who commits one transgression acquires for himself one prosecutor" [How much turmoil must grip one's heart when he reflects that he has massed against himself a great army of such prosecutors!] All this, by a reckoning of four or five words a day, which are common to many men. How much more will there be found, among the notorious speakers of lashon hara, more than two hundred [such] words a day. This is the intent of "All who speak lashon hara magnify sin until the heavens."