Glad you posted this question as I am experiencing just the same, my LO is 16 days old and has been like this for a week.
He seems to have his days and nights mixed up (i know they don't differentiate at this age) but it seems he is definately a night owl, he is up at least every 1.5-2 hrs for a feed and feeds can last from 20mins to 1 hrs per boob. at least once daily I offer him both boobs and he spends an hour on each and still seems not to be satisfied. I am trying to express after the shorter feeds so that I can give it to him later and my body will produce more milk.
Hard going, but I live i hope that it won't last forever!