6,040 patients in the Dialysis Outcomes and Practice Patterns Study were questioned about their recovery time after haemodialysis, with 32% reporting times <2 h, 41% reporting 2–6 h and 10% reporting >12 h. Short recovery time was associated with male sex and high serum albumin levels, whereas long recovery time was associated with older age, BMI and diabetes. Importantly, recovery time positively correlated with kidney failure and mortality, suggesting that the metric might be useful in identifying high-risk patients.