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Not if you're doing it through an email program. You can set it up manually and do it after 30 minutes, but I would advise against it. Just as food for thought, on Friday, 4 hours after an email send I saw a ~20% open rate (11am ET send). As of this morning it was 39%. Obviously this could have had some regionality associated with it, but 30 minutes won't always be very indicative of actual results.
I agree with Dory - 30 minutes is definitely not enough. My team usually likes the same day as well and our data shows our list opens our emails within a few hours. So I set our tests to run 4-6 hours. Dory is also correct, Marketo doesn't let the test run for less than 4 hours.