A typical hangover lasts about 18 to 24 hours from your last drink. Most people feel their worst when their blood alcohol level drops back to zero, which is usually the morning after drinking. From that point, symptoms gradually fade over the next 12 hours or so, though several factors can stretch or shorten that window.
The Average Hangover Timeline
Research tracking hangover duration found that symptoms lasted an average of 18.4 hours after someone stopped drinking, with most people falling in a range of 14 to 23 hours. If you stopped drinking at midnight, that means you’d feel back to normal somewhere between 2 p.m. and 11 p.m. the next day. From the time you wake up, expect roughly 12 hours before symptoms fully clear.
Symptoms peak right around the time your body finishes processing all the alcohol, when your blood alcohol concentration hits zero. This is why you don’t feel the hangover while you’re still drinking or even right after. The worst of it, the headache, nausea, and fatigue, arrives hours later when the alcohol is gone but the damage is still being repaired. Your body is dealing with dehydration, inflammation, disrupted blood sugar, and a buildup of toxic byproducts from breaking down alcohol.
What Your Body Is Doing During Recovery
Your liver processes alcohol using two key enzymes. The first converts alcohol into a toxic compound called acetaldehyde, and the second quickly breaks that down into harmless acetate and water. How fast these enzymes work varies from person to person, largely based on genetics. Some people carry gene variants that speed up the first step but slow down the second, leaving that toxic intermediate floating around longer. Others process both steps efficiently. This is one reason two people can drink the same amount and have very different mornings.
During the hangover window, your blood sugar drops, your blood becomes more acidic, and stress hormones spike. Ketone bodies and free fatty acids rise. These metabolic disruptions are measurable in blood work, but interestingly, correcting them with sugar doesn’t reliably make the hangover feel better. The symptoms seem to follow their own clock, largely tied to how much alcohol you consumed in the first place. The strongest predictor of hangover severity and duration is simply how high your blood alcohol level got.
Factors That Make It Last Longer
Several things push your hangover past that 18-hour average.
- How much you drank. This is the single biggest factor. Higher peak blood alcohol means more processing time and more biological disruption to recover from.
- What you drank. Darker spirits like bourbon contain roughly 37 times more congeners (toxic byproducts of fermentation) than clear spirits like vodka. A study comparing the two found that bourbon produced noticeably worse hangovers, even when the actual alcohol dose was identical. Congeners don’t change how impaired you were, but they do change how rough you feel the next day.
- Your age. As you get older, your body holds less water and processes alcohol more slowly. The same number of drinks produces a higher blood alcohol concentration in your 60s than it did in your 30s, which translates to longer, harder hangovers.
- Your genetics. Variants in alcohol-processing enzymes are common and vary across populations. Some people metabolize alcohol faster, meaning less of it crosses into the brain and the whole process wraps up sooner. Others carry variants that slow things down.
- Sleep quality. People who sleep fewer than seven hours after drinking report more severe hangovers than those who sleep longer. Less sleep doesn’t make the hangover last longer in hours, but it makes every hour of it feel worse.
Does Anything Actually Speed It Up?
The honest answer is: not dramatically. Your body needs time to process the byproducts of alcohol metabolism, repair irritated tissue in your stomach lining, rebalance electrolytes, and calm the inflammatory response. No pill or drink short-circuits that process.
Hydration helps with the dehydration component, which is responsible for some of the headache and fatigue. Sports drinks or oral rehydration solutions can replace lost electrolytes. But IV hydration, the kind offered at hangover clinics, isn’t meaningfully better than drinking fluids by mouth unless you’re vomiting so severely that you can’t keep water down. The University of Rochester Medical Center notes that IV fluids aren’t recommended unless someone truly can’t tolerate oral fluids, and in some cases they can even be risky without checking blood work first.
Eating something helps stabilize blood sugar, which drops during the hangover period. Simple carbohydrates and bland foods are easier on an irritated stomach. Pain relievers can take the edge off a headache, though anti-inflammatory options are gentler on the stomach than acetaminophen, which puts additional strain on a liver already working overtime.
Sleep is probably the most effective tool you have. It won’t make the hangover shorter in absolute terms, but people who sleep more report significantly less severe symptoms. If you can sleep through the worst of it, you skip the peak misery and wake up closer to the tail end of recovery.
When a Hangover Lasts Unusually Long
If your symptoms persist well past 24 hours, something else may be going on. Severe dehydration, alcohol poisoning, or withdrawal (in people who drink heavily and regularly) can all mimic a hangover but last much longer and carry real medical risk. Vomiting that won’t stop, confusion, rapid heartbeat, or seizures are not normal hangover symptoms.
A two-day hangover after moderate drinking is uncommon in younger adults, but it becomes more plausible with age, particularly past 40. If you notice your recovery time creeping up year after year, that reflects real physiological changes in how your body handles alcohol, not just a lack of willpower or toughness.