Lee frowned deeply at Sasuke's words. He did not often grow irritated with others unless they were being purposefully difficult but today seemed to give Lee enough excuse to make an exception. "I would not know! I assume he was either very diligent in his research, or else he took up grave robbing in his spare time."

Lee was the last person to look to for a peek in the mind of a half-crazed shinobi. He wasn't power-hungry or consumed by hatred for any village. If anything, he would have thought Sasuke would have known, having been a comrade of Kabuto's for a time.

"As for time..." An odd question to ask, but if Lee did his math correctly... "It would be over three years, now. The exact number of months escapes me, but it is nearing my eighteenth birthday and I was nearly fourteen when you left." So perhaps closer to four years now. My, how time did fly...