I don't know if I understand you correctly, but I'll take a crack.

Are you trying to get cumulative?:

in your test loop (untested)...

$self->{start} = $self->{start} || gettimeofday():

...

# at end of test

my $end = gettimeofday();
$self->{duration} += ($end - $self->{start});
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Then in your cleanup sub, get the data simply by using $self->{duration}.

If you need a count for each test, keep the existing code, but add at the end:

$self->{tests}{test_name} = $duration;
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Then in cleanup, loop over $self->{tests} and extract the duration for each test.

You'll need to fill us in on exactly what you want for us to give a full response.

-stevieb