I don’t.
I don’t know anyone that does. Other than maybe a god. But I am not sure that even the gods do.
They can travel among the planes at will, but I’m not sure how many, if any, of them are splitting up and acting simultaneously on multiple planes. Not saying they can’t or don’t…
The closest I’m familiar with is when a very powerful Time Warrior (animage) splits him(her)self temporally to surround their opponent.
I’ve seen four or five splits; I’ve heard of six splits. It’s pretty awesome, unless you are their opponent.
However, these are generally of short duration (objectively to observers) of a few minutes at most, typically less than a minute–it’s very depleting.
When Ramses (for example) get’s going with both blades and starts splitting, it generally doesn’t take him long to finish his opponent, especially since some of the splits know what his opponent(s) are about to do, before they do it.