Introduction. Leisure time is an important part of adolescents’ lives, impacting the quality of lives. Engaging in leisure activity promotes health, well-being, social development, individual growth, and life satisfaction. Aim of Study. The aim of study was to examine the satisfaction rate (life) of leisure time in adolescents (n = 1204) of Slovakia. Material and Methods. Survey instrument (satisfaction rate of leisure time) was carried out 6 weeks (May 1 – June 10, 2023) as a way of examining (e.g., analyze, compare) satisfaction rate of leisure time in adolescent boys (n = 542, 45.02%) and girls (n = 662, 54.98%) of Slovakia. Examining the satisfaction rate of leisure time was by means of Assumption of Homogeneity of Variance and Independent Samples, 2-Sample T-Test, and Anova, of which the significance level was 0.01 and 0.05 (Ibm Spss Modeler). Results. Statistical difference (0.01, 0.05) between adolescent boys and girls was in: (i) active leisure (±0.32); (ii) passive leisure (±0.25); (iii) leisure education (±0.20); (iv) leisure caring (±0.10); (v) social leisure (±0.12). No difference (0.01, 0.05), between adolescent boys and girls was in satisfaction rate (±0.08). Within the adolescent boys, 0.01 and 0.05 difference of variance (Anova) was in: (i) active leisure (8.88E-06); (ii) passive leisure (4.24E-08); (iii) leisure caring (0.030); (iv) social leisure (0.008). Within the adolescent girls, 0.05 difference of variance was in: (i) leisure caring (0.020). Conclusions. Engaging in leisure activity provides adolescents with chances for individual growth, stress reduction, and social connection; therefore, it is important to encourage them to make most of their leisure time, which contributes to holistic development, happiness, and life satisfaction.