According to the pools blocks are coming every 85 seconds (should be 30 seconds). So IMHO diff is wrong.
Yes for the pool, but I'm more thinking about a botnet or something like this mining outside pools...
Here is the last network blocks :
02/17/14 14:24:31 SetBestChain: new best=3961ab446cd876537ada height=598216 trust=984307578991 date=02/17/14 14:24:23
02/17/14 14:24:35 SetBestChain: new best=7e477a9ef08472b25c87 height=598217 trust=984326627388 date=02/17/14 14:24:27
02/17/14 14:25:03 SetBestChain: new best=64cc7000794c656eb1d4 height=598218 trust=984345747999 date=02/17/14 14:24:53
02/17/14 14:25:10 SetBestChain: new best=2d9cad58a02fa99666c7 height=598219 trust=984364879922 date=02/17/14 14:25:08
02/17/14 14:25:13 SetBestChain: new best=894ce79cc51d56deee60 height=598220 trust=984384053548 date=02/17/14 14:25:01
02/17/14 14:25:40 SetBestChain: new best=fdb091acdda7799cc3a8 height=598221 trust=984403330374 date=02/17/14 14:25:29
02/17/14 14:25:44 SetBestChain: new best=156d33769cc0322ba29c height=598222 trust=984422612947 date=02/17/14 14:25:35
02/17/14 14:26:04 SetBestChain: new best=0000000012b5e5275362 height=598223 trust=984422637285 date=02/17/14 14:25:47
02/17/14 14:26:15 SetBestChain: new best=000000001256d2091e3b height=598224 trust=984422661262 date=02/17/14 14:26:02
02/17/14 14:27:15 SetBestChain: new best=096f65cfdb815c01de8e height=598225 trust=984442011025 date=02/17/14 14:27:05
02/17/14 14:27:33 SetBestChain: new best=519c578df6fe44dacedf height=598226 trust=984461194353 date=02/17/14 14:27:25
02/17/14 14:27:49 SetBestChain: new best=c196f66ed0e0beb0d7b0 height=598227 trust=984480405500 date=02/17/14 14:27:45
02/17/14 14:28:01 SetBestChain: new best=32aa1702ed1e10ed9b69 height=598228 trust=984499644548 date=02/17/14 14:27:51
02/17/14 14:28:40 SetBestChain: new best=88ac3a6af40c87a97e8b height=598229 trust=984518950822 date=02/17/14 14:28:30
02/17/14 14:28:57 SetBestChain: new best=b0f9e3af9248df8ede61 height=598230 trust=984538232043 date=02/17/14 14:28:47
02/17/14 14:29:26 SetBestChain: new best=2ce638a39068684631ba height=598231 trust=984557549850 date=02/17/14 14:29:17
02/17/14 14:29:53 SetBestChain: new best=c1809e7b3b151d8132ae height=598232 trust=984576867657 date=02/17/14 14:29:43
02/17/14 14:30:10 SetBestChain: new best=d6babce9a9ef02306eff height=598233 trust=984596196670 date=02/17/14 14:30:24
02/17/14 14:30:34 SetBestChain: new best=060bdd0d0c702b2d8e90 height=598234 trust=984615495150 date=02/17/14 14:30:22
02/17/14 14:30:39 SetBestChain: new best=21fc4ac8e402869386f3 height=598235 trust=984634883470 date=02/17/14 14:30:29
02/17/14 14:30:51 SetBestChain: new best=a5fbeb04760a8382d162 height=598236 trust=984654336622 date=02/17/14 14:30:46
02/17/14 14:31:14 SetBestChain: new best=61d9a2267edb4dff595c height=598237 trust=984673826671 date=02/17/14 14:31:02
02/17/14 14:31:37 SetBestChain: new best=aceec4018da3bc0df28d height=598238 trust=984693356531 date=02/17/14 14:31:25
02/17/14 14:32:33 SetBestChain: new best=286647c97baeebf4aff5 height=598239 trust=984712906184 date=02/17/14 14:32:22
02/17/14 14:32:52 SetBestChain: new best=000000001e19ae2db9e2 height=598240 trust=984712931400 date=02/17/14 14:32:37
02/17/14 14:32:52 SetBestChain: new best=743f17c3a1f7e91eb1bf height=598240 trust=984732380008 date=02/17/14 14:32:41
02/17/14 14:32:54 SetBestChain: new best=000000001e19ae2db9e2 height=598240 trust=984712931400 date=02/17/14 14:32:37
02/17/14 14:33:27 SetBestChain: new best=663f96d915952f51b66c height=598241 trust=984732405224 date=02/17/14 14:33:16
02/17/14 14:33:59 SetBestChain: new best=0000000007acff511657 height=598242 trust=984732429278 date=02/17/14 14:33:26
02/17/14 14:34:51 SetBestChain: new best=00000000159dc97180aa height=598243 trust=984732453266 date=02/17/14 14:34:01
02/17/14 14:35:04 SetBestChain: new best=000000001869be327c58 height=598244 trust=984732477236 date=02/17/14 14:34:50
02/17/14 14:35:17 SetBestChain: new best=0000000022cdfd66ea4f height=598245 trust=984732501141 date=02/17/14 14:35:04
02/17/14 14:35:50 SetBestChain: new best=00000000071e02ca20be height=598246 trust=984732525101 date=02/17/14 14:35:20
02/17/14 14:35:57 SetBestChain: new best=a3d4f8c19ca9fa4f750f height=598247 trust=984751931900 date=02/17/14 14:35:48
02/17/14 14:36:22 SetBestChain: new best=00000000069b12be6157 height=598248 trust=984751956013 date=02/17/14 14:35:57
The average is WAY less than 30 seconds.
Even more interesting. What is this? An attack?
If those blocks make it to the regular chain, shouldn't the pools show a far less avg. time per block statistics? And a higher net hashrate? I'm confused.