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T + 1 millisecond seems impossible. Light can only travel a couple of hundred miles in a millisecond.

Famously: http://web.mit.edu/jemorris/humor/500-miles

Expected the sendmail story, got the sendmail story.

So if you're both in NYC it should be fine. At the very least T + ping time + 1 ms

And this should be available to customer investors (dudes at home) before retail investors (hedge funds)

"retail investors" normally refers to individuals at home and T+2 doesn't affect them because they have margin accounts.

The only limitation is that if you day trade, you'll need $25k in your margin account. If you don't day trade or you have $25k, you can withdraw $0.01 a few milliseconds after selling $0.01 in shares

Personally I use the word "retail" to refer to restaurants, stores, malls, and other soulless things that occupy commercial real estate.

I use "customers" to refer to souls that occupy residential real estate.

You can use that, but there are pretty well understood terms in finance already (like retail investors), and probably best to use the standard if you want to be well understood.

I find that obnoxious

Lewis Carroll wrote a gag about people using words like this.

They retail investors, just like the people who patronize all of those businesses are retail customers.

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