Ouch, I believe that is twice in the past week EMC round durations have gone over 1 day. 
Although they did have a run with higher than average earnings right before.

Is this an inherent challenge with smaller pools?  How should I look at this objectively? 

Active Miners    Round Duration    Round Shares    Your Shares    Current Speed    US1    US2    US3                                                    Est. Reward    BTC Earned
2036                    1d 01:30:23    22839171             xxxx                     2.84 TH/s            1205.52 GH/s    1154.73 GH/s    490.66 GH/s    xxx                    0 / 24 hours