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It doesn't matter what mixer you use.

The alcohol takes the same amount of time to leave your system whether your vodka's just on ice or in a large glass of orange juice. Pub measures vary - 25ml (one unit) used to be standard, but 35ml is now more common.

A 25ml shot - is a one-hour drink.
A 35ml shot - is a one and a half-hour drink.
A 70ml double - is a three-hour drink.

If you are pouring spirits yourself, you'll probably pour generous doubles, triples or more. Take this into account when calculating your hours.

Drink four 70ml doubles and you can't drive for 13 hours - that's 1pm the next day if you drank your last double at midnight.

 

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