How long do the effects of energy drinks last?

Dilan Jay's answer:

How long do the effects of energy drinks last?

They probably last five, six hours.

Some last all day, some last all day, without you knowing like for instance, if there's no crash -- which I also don't know of any energy drinks with no crash, other than my own.

So I think energy drinks, depending on how much caffeine they have, how much amino acids they have, how much sugar they contain... You're gonna have different outcomes.

So I would say, though, just typically anywhere between three to six hours.