I don't think you can wait only 24 hours. Your beer probably isn't even cold yet. At 30 psi and room temp, I would shake back and forth (end to end) for about 1 minute, let it sit in the kegerator for a while (maybe an hour?), then come back and reduce to serving pressure. It should be pretty close at that point. If I don't need the beer right away I will let it sit overnight at this point.