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$ ls -lh very_huge.file
-rw-r--r--  1 mario  staff    20G May 24 14:53 very_huge.file
...
user    0m42.494s
sys     0m 7.264s

use MCE::Loop;
use Time::HiRes qw( time );
...

printf "Took %.3f seconds\n", time - $start;