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while (1) {
        my $days = int($runtime / 86400);
...
                $runtime += 300;
                print "Duration: $runtime2\n";
        }

my $epochrun = $epochend - $epochstart;
my $days = int($epochrun / 86400);
...
$minutes = $minutes .'m ';
$epochrun = $days . $hours . $minutes . $seconds . 's';

Starting iostat-10-test-2014_06_30-09:57:35_EDT
Starting vmstat-10-test-2014_06_30-09:57:35_EDT
...
Duration: 0d 0h 50m 0s
Duration: 0d 0h 55m 0s
Duration: 0d 0h 0m 0s