Schedule::Cron might also be a good hammer for this nail.

use Schedule::Cron;

# Create a Cron object and assign a coderef to it
my $cron = new Schedule::Cron( \&check_website );

# Establish the time interval between runs.
# This follows the standard cron notation.
$cron->add_entry("* * * * *");

# Run cron job.
$cron->run();

sub check_website { 
   warn "Checking website...\n";   
   # code
}
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