in reply to How can I keep track of the execution time of a script?

use Timer::Runtime

Example: duration.pl 
#!/usr/bin/perl

use Timer::Runtime;

print "hi\n";

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Outputs: 
$ perl duration.pl
duration.pl Started: Fri Aug  5 01:48:14 2016
hi
duration.pl Finished: Fri Aug  5 01:48:14 2016, elapsed time = 00:00:0
+0.000398
$

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In Section Seekers of Perl Wisdom