Being buzzed does not have symptoms as severe as being drunk; but since it decreases motor skills and starts to have an effect on the brain, you should still get a designated driver if you're out & feeling buzzed. And once you had enough drinks to pass the buzzed stage, you'll likely start to feel drunk.
How long does being buzzed last?
Generally speaking, it takes about 6 hours for the effects of being drunk to wear off. If you count the hangover/detoxification period that happens after drinking alcohol, the effects may last longer.
Whats being buzzed mean?
US. drunk or under the influence of a drug: I was arrested just because my friend was driving a little buzzed and I was the passenger.