In 2m 45s
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Frankly, I would have done better, but I got down to the last few states (I went west-to-east) and it was kind of hard to tell which ones I hadn't gotten at that point (hey, Rhode Island and Delaware are easy to miss!) so I had to spend some time squinting at the map. Beware, though ... the counter starts as soon as you load the page, and it's not at all forgiving about typos (I was one "i" short in Louisiana which cost me about 5 seconds to correct)!