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$VAR1 = {
    'host' => {
...
                       },
                 },
        };

%Hash -> $host -> $batch -> $run -> 'jobs'      -> $jobname -> 'durati
+on'
                                 -> 'duration'             -> 'end'
                                 -> 'start'                 -> 'start'
                                 -> 'end'

foreach $host ( keys %hash )
{
...
        }
    }
}