Open Question: how long of a time period does the movie Fight Club take place?

How long there is no movie Fight Club? Like is among the last few weeks, when Edward Norton tells us that the Household Expenditure Survey insomnia, pain, and began to support groups, and when he (** spoiler warning **) seedlings at the mouth in the movie to end their own, Or a couple months? I do not think they said in the film, but they said that this book? Just want to know how long period of time to the beginning of the end span of the movie … Thank you.