During high school, he played for three years at Baggataway Club in Victoria, B.C.
Duch played college lacrosse for the Stony Brook University Seawolves.
He appeared in all 15 games and recorded 22 points off 15 goals and seven assists, and scooped up 16 ground balls During the season, he handed out an assist and picked up three ground balls versus Harvard (3/4); tallied a goal and recorded three ground balls at Army (3/7); dished an assist at home against Rutgers (3/28); tallied two goals in America East opening win against Vermont (4/1); tallied a goal and an assist in win over Denver (4/3); had a career game at Albany (4/8), registering six points off five goals and an assist to lead the Seawolves to victory and earn America East Player of the Week honors; recorded a goal and two assists in a win at Lehigh (4/12); registered a goal and an assist vs. Hartford (4/15); found the back of the cage three times and scooped up three ground balls in a win over in-state rival Binghamton (4/22); and scored a goal against Hofstra (4/25).
In 2008, Duch played in every game with nine starts, was named to the second team All-America East, and led the Seawolves with a career-high 28 assists.
That mark placed him seventh in the Stoney Brook record book for assists in a season.