I've long been a proponent of this change and I'm very glad to see it finally implemented. I originally proposed setting it at 5 minutes about a year or two ago, but at the time it was instead reduced from 30 to 15 minutes as a compromise of some kind. But even 15 minutes was too much, IMO, because I think many voters weren't aware of it or didn't have the patience to wait that long before voting on a "hot" post, so they wound up losing curation rewards for no good reason.