When you start to mine in antpool? you should get a good luck if you start to mine before 2014-11-13 02:53:23. 4 blocks were found in 1.5hours 
Block #   Timestamp   Block Hash   Value   Status   Duration   Hashrate   Total Shares
329762   2014-11-13 02:53:23   0000000000000000066f5ea26eef473b1bc0d418a039fd8b5b6453017241aa09   25.06607468   4/120   57m 35s   32.05%   15.78 PH/s   12,693,446,432
329756   2014-11-13 01:55:48   0000000000000000142e4750625b6f87217f0b8311c3a9a97382363f3fdcd640   25.1560888   10/120   5m 47s   3.66%   17.96 PH/s   1,451,205,504
329755   2014-11-13 01:50:01   000000000000000019ff29a66f5c4a7a749f22fe345600275b3915349029a903   25.26248889   11/120   8m 13s   5.09%   17.57 PH/s   2,016,682,704
329754   2014-11-13 01:41:48   0000000000000000000c0d8af8b12fce253dcfd16c993d0f53f1df223a891e75   25.37626743   12/120   10h 16m 57s   338.80%   15.57 PH/s   134,181,900,977