1 minute is enough for MOTM. If someone comes on for the last minute and grabs the only goal, the winning goal, in an otherwise dour match, by running around each player in the oppositions team (twice) - then that player deserves MOTM. Duffy didn't do this, but if people think he did enough in that 29mins to propel him ahead of his team-mates then who am I/you to say otherwise?