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my $start_time = time;
END { my $exec_time = time - $start_time;
      print("Program took $exec_time seconds to execute\n"); }

...[ put rest of program here ]...

my $start_time;
BEGIN { $start_time = time; }
...
        print("Program took $exec_time seconds to execute\n"); }

...[ put rest of program here ]...