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How long should the test duration for an a/b test be?

Question asked by b6ef7f73b2351422d1ddff0acf81fddef32a63bf on Jan 20, 2015
Latest reply on Jan 25, 2016 by e5fc76cc5f2576e9ca513a0c82939e2fbbbbfe8f
I have a email going out tomo to 20K ppl with an a/b test on the subject line.

I really don't want to wait too long to send out the winner bc I want it to go out tomorrow, not another day (it's related to a launch).

How long does Marketo wait before it declares an email has not been opened? I suppose that 1 hour might not be enough?

Thus, is 1 hour enough to reach the sample size of 10%?