That would all depend on how parallelizable the task is (for example if its too small to subdivide its not worth it) and how well the algorithms work.
But in general huge tasks that split up easily have no limit. But at some point you're going to hit a RAM limits or other bottlenecks. Especially if the number of cores starts exceeding what can go into one processor. Soon the network becomes the bottleneck.
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That would all depend on how parallelizable the task is (for example if its too small to subdivide its not worth it) and how well the algorithms work.
But in general huge tasks that split up easily have no limit. But at some point you're going to hit a RAM limits or other bottlenecks. Especially if the number of cores starts exceeding what can go into one processor. Soon the network becomes the bottleneck.