Starting difficulty was really low so the "60 second" blocks were being found in less than a second each. A coin "day" is the number of blocks in a usual day at 60 second block time. With the huge network hashrate a "days worth" of blocks was found in less than 30 minutes. The 1440 block difficulty-retarget didn't help this either. Everything has calmed down now. The difficulty is now at 10 and the "Est. Avg. Time per Round (Network) = 1 minute" so difficulty will now retarget about this time tomorrow (if the network hashrate stays roughly the same that is.)
So this means the 2 days of bonus blocks were mined in an hour?
Way to go ! Well thought developers,...