Milk Supply and Breast Feeding Time Issues

How is his weight doing? Is he gaining enough?

Pay attention to how he is nursing. When he is actually eating you should hear him sucking and swallowing. I would bet after about 20 mintues that he is just sucking. Which means you have turned into a pacifer. It happened to me. When i realized he was not eating any more i would just pop him off and give him an actual pacifer. He was pretty pissed off for a day or so but then got the message and stoped nursing when he was done eating. If that does not work contact your local le leche legue. They should be able to help you.
A.

as long as he's gaining I wouldn't worry.
he just might be a slow nurser.

An hour does sound like a long time for a nursing session at six weeks. As my babies got bigger, they were able to nurse faster and got to a point when they could finish a full nursing session in about 10 minutes (or less--there's so much more to do, see, and play, they seemed to not want to waste time eating). So he might speed up on his own as he grows. But it still does seem like too long...

Have you already talked to a lactation consultant or a support group? (There is a good breastfeeding support group that meets once a week at Good Samaritan Hospital--or at least it used to, you might call them or look online for more details.)

Does your son actually get milk for the whole time nursing, or can you tell if he shifts from getting milk to mainly soothing with the nipple? If he is nursing that long, I would suspect that he's really only getting substantial milk for the first 15 minutes (or less) and then just enjoying the closeness and soothing there. If that's the case, then it's probably better for you (and your milk supply) to stop the nursing session after the main milk flow has subsided and he's only getting a few drops, then shift to a different activity or comfort position. Also, more frequent, shorter feedings will lead to increased milk supply better than longer, less frequent feedings.
Good luck with it all.