Just noticed the issue last night with one of my "255 hold time" systems as well. Glad you caught this and brought it up. Oddly display on-time doesn't have as much impact on battery run time as I would expect it to, so from that angle it's not a huge deal. However at night when even the dimmest setting on black and white mode is used, it is still very bright to be on constantly in a dark bedroom (sitting on the nightstand nextvto me). I'm thinking this could be an easy firmware fix.