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use strict;
use warnings;
...
sleep 3;

warn "total sleep( $sleepcounter )"

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C:/Perl_64/bin\perl.exe  d:/Users/lanx/pm/core_sleep.pl 
Version 5.016003 at d:/Users/lanx/pm/core_sleep.pl line 4.
...
start wrapper at d:/Users/lanx/pm/core_sleep.pl line 13.
stop wrapper at d:/Users/lanx/pm/core_sleep.pl line 16.
total sleep( 3 ) at d:/Users/lanx/pm/core_sleep.pl line 26.