Suspicious comment from someone called Starman. I'm not sure I believe you...
Out of curiosity, how would you say "second" as in a second serving of food? What about one's second in a duel?
it does not make sence to ask in non-slavish Languages "Do you have a second" I tried to translate "Do you have a moment" because that is what I would say on English, but it was wrong
I'm pretty sure that I've heard "Do you have a second" in English many times.
With 'a moment', you can easily say the same by asking "Masz moment?" or "Masz chwilę?"
Isn't it already implied you are talking with a person so that using "you" in this sentence is a correct /formal example but also correct would be: "Have a second?"