It's kind of crap that the minimum time for an A/B test to determine a winner is 4 hours. Imagine it's on Friday and you're trying to finish up something around noon. There's already a 15-minute forced lag to get the thing out, but now if you're A/B testing (which someone on your team could be adamant about), you're basically struggling to get the bulk of your email into people's mailboxes before 5. So maybe shorten that? Seems arbitrary anyway.
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