How long for 4 drinks to leave your system?
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About 6.5 to 12.6 hours from the first sip for most adults, at an average clearing rate. That’s about 7.4 hours for a 190 lb man and 10.4 for a 160 lb woman. Four drinks that start at 9pm are still in a lot of people at breakfast.
By the one-drink-an-hour rule, four drinks should be gone four hours after the last one. The real number is about twice that for most bodies, because the liver can’t speed up to meet a bigger evening.
What we’d do
If you need a clear head tomorrow morning, treat four drinks as the whole night’s budget and start early, with dinner. Better still, make the last two 0% drinks. And count by the pour first, because four 16 oz IPAs is 7.5 US drinks, which is a very different night from four 12 oz beers.
Why does four take so long?
Go back to the checkout lane. The liver’s enzyme fills up after the first drink or two and then clears a fixed amount an hour, about 15 mg per 100 mL on average, according to a 2010 review of the published rates. Four drinks are four customers in one line. The fourth one waits for the first three, and none of them goes faster because the line is long.
How long, by body
On our engine, with four US drinks spread over the first hour and food not known, this is the time from the first sip until it’s mostly cleared. The range is a liver at the fast and slow ends of the normal range.
| Body | Four US drinks | If they start at 9pm |
|---|---|---|
| Woman, 130 lb | 12.6 hours (9.5 to 18.8) | about 9:35am |
| Woman, 160 lb | 10.4 hours (7.9 to 15.5) | about 7:25am |
| Woman, 190 lb | 8.9 hours (6.8 to 13.2) | about 5:55am |
| Man, 160 lb | 8.6 hours (6.5 to 12.7) | about 5:35am |
| Man, 190 lb | 7.4 hours (5.6 to 10.9) | about 4:20am |
| Man, 220 lb | 6.5 hours (5 to 9.5) | about 3:30am |
The ranges are wide because livers differ. A slow liver can stretch a 160 lb woman’s four drinks to 15 hours.
Does spacing them out help?
It lowers your peak, but it barely moves the finish. On our engine, a 150 lb woman who has four drinks from 8pm is mostly cleared about 7:05am if she has them all in two hours, 7:10am at one an hour and 7:20am at one every hour and a half. The same alcohol has to go through the same lane, however slowly it arrives.
Which four drinks?
| Four of these | US drinks |
|---|---|
| 12 oz beer, 5% | 4 |
| 6 oz glass of wine, 13.5% | 5.4 |
| 16 oz IPA, 7% | 7.5 |
| 12 oz craft beer, 10% | 8 |
NIAAA counts 4 or more drinks on any day for a woman, and 5 or more for a man, as a heavy drinking day. Four restaurant glasses of wine is over both. Four IPAs at one an hour from 8pm are mostly cleared about 9:05am for a 190 lb man, and a 150 lb woman would still be clearing them in the middle of the next afternoon.
Where the numbers stop
It’s an average. Your own level can be higher, and it can keep rising after your last drink, according to NIAAA. The engine doesn’t know your medicines or your liver, and it’s never a test of whether you can drive. Don’t drive after drinking.
When will it be out of my blood?
Out of your blood
Mostly cleared about 2:50am
That's 6.8 hours from your first sip, between 2:05am and 3:55am if your liver runs faster or slower than average. About 3.8 hours of your sleep overlap it.
This is an average curve. Your own level can be higher, and it can keep rising after your last drink. Never use it to decide whether you can drive.
The signs of an alcohol overdose
Call 911 right away if someone who has been drinking has any of these:
- Confusion or stupor
- Can't stay conscious, or can't be woken
- Vomiting
- Seizures
- Slow breathing, fewer than 8 breaths a minute
- Irregular breathing, 10 seconds or more between breaths
- Slow heart rate
- Clammy skin
- No gag reflex
- Very low body temperature
- Bluish skin or paleness
Don't leave them to sleep it off. Cold showers, hot coffee and walking don't reverse an overdose. NIAAA on alcohol overdose
18.9 g, 1.35 US drinksoz%- 18.9 g, 1.35 US drinksoz%
The dashed line is the myth. If your liver really cleared one US drink an hour, these drinks would be gone by 11pm. On an average liver they last until about 2:50am.
How long for N drinks?
4 US drinks spread over an hour, for your body: mostly cleared about 11 hours after the first sip (8.4 to 16.4 if your liver runs faster or slower). Started at 9pm, that's about 8:00am.
| US drinks | 1 | 2 | 3 | 4 | 6 | 8 |
|---|---|---|---|---|---|---|
| Hours from the first sip | 3.1 | 5.9 | 8.5 | 11 | 16.1 | 21.2 |
With Gyroscope One, snap or tap each drink and see what it did to your resting heart rate and sleep. How it works
For adults of legal drinking age, 21 in the US. If you're pregnant or trying, the CDC says there's no known safe amount of alcohol.
4 sources
- Jones AW, Evidence-based survey of the elimination rates of ethanol from blood with applications in forensic casework, Forensic Science International, 2010pubmed.ncbi.nlm.nih.gov
- National Institute on Alcohol Abuse and Alcoholism, What Is A Standard Drink? Updated December 2025niaaa.nih.gov
- National Institute on Alcohol Abuse and Alcoholism, Drinking Levels and Patterns, updated January 2026niaaa.nih.gov
- National Institute on Alcohol Abuse and Alcoholism, Understanding the Dangers of Alcohol Overdose, updated December 2025niaaa.nih.gov
