My tech one goes the whole 5000 characters. But my moral whatever is only 3000. ANyone cut there's short too? It's not that I can't write more.. it's just that I have written a perfect amount to get my point across.
You certainly don't need to keep writing once you've said what you want to say. The adcomms don't want to read fluff. But make sure you have someone else read your essay to be sure that it's as clear and complete as you think it is.