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

1 hours, 19 minutes, 378 seconds

...

...
printf("%s hours, %s minutes, %s seconds\n",
   $dur3->in_units(qw( hours minutes seconds ))
);

1 hours, 19 minutes, 378 seconds
1 hours, 25 minutes, 18 seconds   # All of the minutes had 60 seconds.
1 hours, 25 minutes, 19 seconds   # One of the minutes had 61 seconds.