Heritage language learners may also have a smaller quantity of input than their monolingual peers because the heritage language is only found in a restricted number of contexts and with fewer interlocutors. Citing statistics found in studies on hearing children with deaf parents, Flores and Barbosa (2014) posit that bilingual heritage language learners need a minimum of 5 to 10 hours of interaction per week with the language to develop native-like proficiency. Hours of input may be particularly restricted once the heritage speaker switches to the dominant language.[1]