How big can you get naturally & lean?

As much as ive ragged on gymcelling, i think its worth doing so im probably going to do it again. This time though im going to get lean and stay lean. No more jason bloho rippetoad style training. But how big can you even get. I think im underestimating how much size you can put on since muscle is denser than fat so even if its not a lot of kgs, its still lots of surface area. Idk.