As a user, my expectation is that I should receive an email notification in a minute or less, otherwise I assume that the email functionality is broken. Some Aha! emails come through almost instantly, while others take anywhere between 5 and 30 minutes. I understand the justification behind delaying emails until an action has been completed, but I can't imagine why it should be delayed any more than 30 seconds to one minute after an action has been performed without future activity.
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