The issue for that (along with quite a few others not mentioned in the post) is still listed in the HF20 project: https://github.com/steemit/steem/issues/1878. The current proposal has it being changed from 30 to 15. I'd be in favor of it being taken down to 5, but iirc they did not want to go too extreme due to wanting to quickly reach concensus on the set of changes in the HF.
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IMO the 15-30 minutes is 'extreme' and human users of the platform (including both more- and less-informed ones) have been stating that for two years. But anyway, 30->15 minutes is a step in the right direction.