The original study about the "available milk in a few minutes"
wasn't challenged until the late 70s (?). I believe Kittie Frantz was
one of the first to do so at the USC Breastfeeding Clinic and found
continuous "let-downs" every 5-7 minutes as long as there was nipple
stimulation. She postulated that the original researchers noted the
initial let-down, then stopped their investigation as the milk tapered
off, concluding that there was no more milk and that must be "all" the
baby needed. She thinks they stopped a minute too soon; if they had just
continued to watch, they'd have seen another let-down.
 I think you are referring to the early study done by Lucas at Oxford,
published in the Lancet in 1972, I think. I told him that many US
pediatricians seem to have  concluded study that as most of the feed was
thought to be delivered in 5 mins then 10 mins per side is a safe bet. He
replied that THAT conclusion was not intended and he did not believe in
such time limits.
I suspect he is aware of the limitations of that study. This is the same
Alan Lucas who did the study of intelligence in premies who received
breastmilk OR abm in the NICU.
Shalom! Margot C.Mann IBCLC New York.