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Only gets you half instantly and the rest after 3 days which would miss the snapshot, also costs 5% as it's mainly meant to be used when HBD is overpriced.

actually I just realized that HBD > Hive is the old way right? So no 5% fee.

You don't get half right away on HBD->HIVE conversion. In that direction you have to wait the 3.5 days for all of it.