Well, it varies with everyone and there is nothing specific about how many days will it last but if you want an average then, in our opinion a Zippo lighter can last up to 1 week. After that, you will have to refill it.

How long will a Zippo hold fuel?

A Zippo lighter will keep its fuel supply for about two to three weeks in nominal conditions. But most of the time its fuel evaporates entirely in one to two weeks. Contrast that with a Bic lighter which can maintain its fuel supply for a couple of years before evaporation slowly claims it.