3 day old baby feeding 2 hours straight!?

I had my baby on the 16th and because of cirrculation problems they had to take him to the nic unit so I didn't get to be with him untill 4 hours after birth then he wouldn't take to the untill 2 hours after that. He only ate twice that whole day and now has jaundice. He has gotten the hang of it (once I started using a nipple sheild) and now he nurses every 3 hours and nurses between an hour to two hours at a time!! My milk supply is fine I pump after he feeds to keep up my supply and get out lots of milk out but he wants to nurse forever. My are starting to get real sore using the lansinoh nipple cream which is helping but I took him to the er because he's getting very yellow they took blood and said it is a little high but not high enough to worry about. Anyways I asked the doctor at the er about him feeding him for an hour to two hours at a time he said let him feed 5 minutes on each side then give him a pacifier does that sound right? When I got home I still let him eat till he was full anyways just because he acts as if he's starving if I pull him off too early. Plus I'm afriad he'll get nipple confusion if he is always given a pacifier. So my questions are: is it normal to feed for that long? Should I only feed him for 5 minutes? that doesn't seem very long at all to me. He said with jaundise to STOP feeding and maybe it will get better but the labor & delivery nurses told me I should b.f more frequently which of those sounds right that you know of? Thanks