Your little one is what Dr. Sears refers to as a high needs baby. (www.askdrsears.com)
My daughter was this way when she turned 2 weeks and became colicky. She would FINALLY calm down and begin to nurse for hours.
My son was like this from birth. He loved to nurse forever - especially in the evening. It does not last very long. At a few months, he started putting himself on his own schedule. I find when he is having a growth spurt, he nurses more at night. It does get better - now he nurses for 10-15 minutes throughout the day.
It was a great bonding experience, but I know it can get tedious. Keep your chin up. Just remember they are only little once!