Background: Post-COVID-19 patients commonly experience reduced endurance and impaired quality of life (QoL), potentially influenced by hospitalization. However, the relationship between duration of hospitalization, endurance capacity, and QoL remains unclear.

Objective: To determine the association between duration of hospitalization, endurance levels, and quality of life in post-COVID-19 patients.

Methods: This cross-sectional correlation study included 30 post-COVID-19 patients aged 20-30 years, hospitalized between 2021 and 2022, and assessed a least 100 days post-discharge. Endurance was measured using the Six-Minute Walk Test (6MWT), and QoL was evaluated using the Short Form-36 (SF-36) questionnaire. Pearson’s bivariate correlation analysis was used to assess relationships between duration of hospitalization, endurance, and QoL domains.

Results: The findings demonstrated a weak negative correlation between duration of hospitalization and endurance level (r = -0.213, p = 0.259), which was not statistically significant. Similarly, weak negative correlations were observed between hospitalization duration and all SF-36 domains, including physical functioning, role limitations (physical and emotional), energy/fatigue, emotional well-being, social functioning, pain, general health, and health change (p > 0.05). None of these associations reached statistical significance.