I have 3 render layers that I'm compositing together in the 4th one. Everything works fine, but even if I don't see the layer in some specific moment blender still renders it. The problem is that I use the Cycles volumetric light for a short time then it disappears and we don't see it anymore but it still takes forever to render even though every single light in the layer fades to black. How can I make it stop rendering what I don't need anymore?
P.S. I know, I can render it part by part and then composite a video, I can even render it with image sequence to not to lose any quality with re-encoding video, but it would be wonderful if it could be done withing blender compositor and animation system.