The liver can develop new cells, but prolonged alcohol misuse (drinking too much) over many years can reduce its ability to regenerate. This can result in serious and permanent damage to your liver.
Alcohol changes the chemicals that break down and remove scar tissue. This means that scar tissue builds up in the liver. Scar tissue replaces normal healthy cells. This means that the liver can't work properly and can fail, leading to death.
Some alcohol-related liver damage can be reversed if you stop drinking alcohol early enough in the disease process. Healing can begin as early as a few days to weeks after you stop drinking, but if the damage is severe, healing can take several months.
Each individual is entirely different. Complication can develop after 5 to 10 years, though it more commonly it takes 20 to 30 years. Many individuals appear to never develop end stage liver disease from alcohol. This is impossible to predict ahead of time.