Quote Originally Posted by DDBen
Actually this is incorrect Naruto has several breaks during his training for a unspecified amount of time due to mental fatigue when he stops to gain the knowledge from his clones. Kakashi stated it took him a few hours for 6 hours worth of training and if anything he's learning even faster then expected.

edit: changed years to hours.
It doesn't matter. I'ts horrible logic anyways. See, it doesn't instantly equal 1000 days, even if the 1000 clones took a full day of training.

Let me see if I can explain more clearly...

Let's say Naruto is given a book. He uses Mass Clones to each read one chapter. He then dispurses the clones and then he has read a full book in only minutes.

That's not the case here. All the clones are on equal ground, so they are in essence reading chapter 1. He'll just understand Chapter 1 really well by the end of it.