Is GPU Lightmass limited to vram or GPU strength?


I am relatively new to baked lighting. Have finally setup GPU lightmass on my GTX 1080 and it works very well.

Before I start using this more extensively, I wanted to confirm if I will face issues with larger levels. Is it that GPU lightmass can not be used with large levels because the VRAM would somehow get full?

I am hoping a large level can be processed and it will simply take more time.