How Long Does It Take to Design a System?

When i design something, it typically takes about three tries before i get the design right. And so the third iteration is fine tuning. Once you have that, then systems tend to stand the test of time pretty well. But now, your question was thit there's something where you have a module really worked well. I don't even neesrely me set offor, by the way, right, like, maybe, like,maybe real world, or or examples of how iterations and designs have changed overtime.