I am bf-ing my 2.5 week old. He tends to feed in 5-10 minute bursts, with a minute or two sleep between. When he's been on the same side for more than 20-30 minutes, I tend to switch sides (mostly because by then my nipple is burning and needs a break!)
But this week I went to a BF-ing support group, and there was a woman whose 4 week old fed (strong sucking the whole time) on the same side for a full 40 minutes before falling asleep. And the BF counsellor said to her that when the baby wakes, she should put her back on the same side so she could get the hind milk.
So my question - how long does it take for the hind milk to come through? How long does a baby need to feed on the same side to get to the hind milk, and how do you know s/he's got some?