Blessing on the Torah Learning

דברים פרק יז, יט וְׁקָּרָּ א בוֹ כ ָּל-יָּ

יַח יֵּמְׁי ו ספרי לרבות הלילות
In Menachos, the Gemara learns the concept from the verse in Yehoshua והגית בו יומם ולילה
Tosfos learns from these two places, that a person does not make a new blessing every time that one sits down to learn Torah. Rather, similar to one who is constantly in a Sukkah, one makes one blessing in the morning for the entire day and night. One does not lose one’s connection to the concept of learning since always obligated, and thus, only needs the one blessing for the entire day.