Yeah, they overlap since I did whole hour (120 30-second codes). I didn’t know specific time, so it’s 2 pages, 3 hours, 42 minutes and 30 seconds.

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    15 hours ago

    One of the banks I’ve used actually had a bunch of codes printed on a scratch-to-reveal card, as a form of 2fa. Not time-limited, though, at least not per code. This was pretty long ago, even — around 2010.