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...
   11 SessionOpen  c 123.234.56.78 63618 123.234.56.89:80
...
   11 RxHeader     c Accept-Encoding: gzip, deflate
   11 ReqEnd       c 1832330560 1372436083.710740089 1372436083.711302
+519 0.000174284 0.000352383 0.000210047
...

varnishlog -o -i Backend,RxURL,ReqEnd,RxHeader | perl -ne 'BEGIN { $/=
+ "";} print if (/ReqEnd(?:[\sc]+)\d+\s\d+.\d+\s+\d+.\d+\s+\d+.\d+\s+(
+\d+.\d+)/ and $1 > 10.0)'