right abbreviation for minutes, hours : mins,hrs OR min,hr? What is the right abbreviation for minutes, hours? mins,hrs OR min,hr Is there a difference between tenses : Adjective and nouns? ex) This is a [30-min/30-mins] class. It will take [30 min/30 mins]. This is a [2-hr/2-hrs] class. It will take [2 hr/2 hrs].