How long do you have to wait until your baby mallard duck can go swimming?

Ducklings begin to develop their adult voices around 6 weeks of age. The stereotypical loud "Aflac" quack is the hallmark of a female (hen) duck's voice and the soft whispery voices belong to the male (drake). This holds true for all mallard derivative ducks which is essentially all domesticated ducks except the Muscovy.