DEUT253 "You shall teach them diligently to your children, and you shall talk of them when you sit in your house, and when you walk by the way, and when you lay down, and when you rise up." Every single word of the Torah that you study is a fulfillment of a mitzvah (see Shnos Eliyohu-Paiah). Conversely, for every single word of loshon hora that you speak, you are guilty of bitul Torah, not having spent your time fruitfully in studying Torah.