use strict;
use warnings;

use DateTime::Duration qw( );

my @times = qw( 5:21 8:01 5:37 7:19 5:46 7:44 6:43 7:17 8:02 6:50 7:54 8:44 );

my $dur = DateTime::Duration->new();
for my $time (@times) {
   my ($mins, $secs) = split(/:/, $time);
   $dur += DateTime::Duration->new(
      minutes => $mins,
      seconds => $secs,
   );
}

printf("%s hours, %s minutes, %s seconds\n",
   $dur->in_units(qw( hours minutes seconds ))
);