3 days is even better but I didn't want to rock the boat too much ;)
Hardly anybody votes after 24 hours of publishing. Maybe some freaks who optimized for farming. These guys have no trouble adjusting to 3 days.
I don't care about that exchange voting issue at all. Not their coins, not their vote.
Because Hive has a history with exchanges using coins in creative ways, we could keep the 30 days governance voting delay. We could even increase it to a lot longer. Governance is not the main reason that makes Hive appealing to a broad audience. Governance actions are infrequent anyways. That means it doesn't matter much if your powered up stake registers now or in a few weeks.
Governance action are not frequent but they are at the bottom of the security of the chain. Imagen this chain being attacked again, and the attack is successfull? Wouldnt that make people think twice about this whole network?
If this chain is being attacked by colluding exchanges, again, and a 30 day delay doesn't prevent that, what is the chain worth?
A group of colluding actors will not be deterred by an extremely long powerdown period because they can change it.
It happened at Steem.
I think the 30 days delay in voting is a nice solution, people will notice if a stake with a size that can influence governance is powerd up and take action... even with a short power down periods.