the argument smooth makes about voting with multiple accounts makes ZERO sense if the power down period is more than 24hrs...

The initial voting period for a post can extend for up to two weeks (especially if someone has an incentive to deliberately extend it) and the second voting period runs for 30 more days. One of the most widely requested changes from authors is to extend voting even longer so they can continue to be paid for work which has long-term value. That sits in direct contradiction to making the vesting period shorter.