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The article is devoted to the problems of binaural cochlear implantation, especially in patients with a long time interval between surgeries. The purpose of the study was to evaluate the effect of the time range between successive interventions in patients with binaural prosthetics using the CI system., Materials and Methods: the study included 50 patients aged 10 to 14 years, divided into 3 study groups: patients with unilateral cochlear implantation (group I), patients with bilateral implantation with a less than 1 year range between operations (group II) and patients with bilateral implantation with a more than 5 year range between interventions (group III). Comparative analysis was carried out using speech audiometry in silence and noise, assessment of sound localization and questionnaires to assess the auditory dynamics and speech development., Results: Patients in groups II and III showed comparable results in speech intelligibility in noise and sound localization. At the same time, these indicators turned out to be higher than in patients of group I. Patients from all three groups did not show statistically significant differences in speech intelligibility in silence and in the level of speech development., Conclusion: a long interval (more than 5 years) after the first implantation should not be considered as a contraindication to binaural implantation.