How long can you survive on ECMO?

I'm curious to know, how long can a patient typically survive on ECMO, or extracorporeal membrane oxygenation? Is there a general timeframe or does it vary greatly depending on the individual's condition and the severity of their illness? Are there any factors that can influence the duration of ECMO support, and what are the potential risks and complications associated with prolonged use of this life-saving technology?