Why did Yaakov suggest such a long period (7 years) of labor in exchange for marriage? Rabbeinu Bechayeh and Chasam Sofer

Why did Yaakov suggest such a long period (7 years) of labor in exchange for marriage?
Rabbi Eli Silberstein

Why did Yaakov suggest such a long period (7 years) of labor in exchange for marriage? Rabbeinu Bechayeh and Chasam Sofer