Research suggest that while a non-native speaker may develop fluency in a targeted language after about two years of immersion, it can actually take between five and seven years for that child to be on the same working level as their native speaking counterparts.
As investigacións suxiren que, aínda que un orador non nativo poida desenvolver fluidez nunha lingua específica despois de dous anos de inmersión, pode levar entre cinco e sete anos que un neno teña o mesmo nivel de fala que os seus homólogos.