[ Suigetsu's observation isn't one that's escaped Sasuke. He knows that he himself had extra time and training that he could hold over Suigetsu's head and he wants to see just how much his partner stands to grow now that he's free again. ]

Hn. I'm not making any promises. I don't owe you anything, not beyond helping you realize your dream, which I won't rescind.

Get stronger faster, if you want to be sure.