my guy has recently started nursing for a much shorter amount of time on each breast but he continues to gain appropriate weight. i can only assume he's getting better at draining me quickly. he now does 10-15 minutes on the first side and 10 minutes on the second side.
how long does your little one nurse for on each side (or one side if that's all you offer)? 
Re: how long does your 2m old nurse for?
My LO used to nurse for 30 mins total, 15 min each side. Now its decreased dramatically and she'll only nurse on one side for about 10 minutes and she's done!
Me too. Sometimes even 6 minutes (although she'll eat again sooner if she does 6 minutes).