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Because smaller bidders were ending up with such a small % of the overall vote power that it was sometimes skipping them entirely. That can still happen with the longer terms, but its able to be split into far more usable portions this way.

Perhaps it could alternate between multiple bidding time windows - eg: 1hr window, then 2 30 minute windows, 4 15 minute windows etc .

Its all an experiment / learning process, I'm open to any suggestions