How many years did Jacob first offer to work for Rachel?

Answer: Seven

Jacob offered to serve Laban seven years for Rachel, and they seemed but a few days because of his love for her.

“Since Jacob loved Rachel, he answered, “I will serve you seven years for your younger daughter Rachel.” Laban replied, “Better that I give her to you than to another. Stay here with me.” So Jacob served seven years for Rachel, yet it seemed but a few days because of his love for her.”— Genesis 29:18-20 (BSB)