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Hi op. I have over a decade experience in competitive drinking being a senior member of a German Burschenschaft.
If you are allowed to vomit, jug it all at once then just finger your throat and vomit it all out again.
With this technique I could drink and vomit a liter of beer in about a minute.
If you are not allowed to vomit, eat a shitton of fatty food and drink a good portion of the liquor at the very start. You will feel drunk as fuck and it will stay that way, but you should not overdose. At the end of the timeframe eat a lot of fat again and drink the remaining liquor last second.
This will minimize the max blood alcohol level you will reach.