Background and aims: Legacy gambling harms are negative consequences of gambling that extend past periods of low risk, moderate risk and problem gambling. Gambling harm is typically measured within a 12-month timeframe and is often restricted to examining harm amongst active gamblers. The present research aimed to explore whether people experienced gambling harms 12 months or more after the resolution of at-risk or problem gambling, and how long these legacy harms lasted. Methods: An online survey was conducted in New Zealand with past and current gamblers and concerned significant others (CSOs) of gamblers, N 5 1,240 (50.8% female), that asked them about both past and current gambling harms. Results: A majority of both gamblers and CSOs of gamblers indicated that they still suffered from gambling harm even after most of their behavioural issues with gambling had been resolved, 12+ months ago. Legacy gambling harms reduced over time, with harms diminishing most quickly in the early years, and having an average half-life of 4 years. Harms involving community-relationships, church involvement, and domestic and other violence resolved more quickly than others. Discussion and conclusions: Legacy harms are common among ex-problem gamblers and should be considered in any full accounting of the impacts of gambling. Conclusion: Understanding the time course and persistence of legacy harms from gambling can provide gamblers, treatment professionals and public health experts with insights into how to address gambling's long-term consequences.  Kulcsszavak: harm, long-term, lifetime, legacy, wellbeing, residual