What is the maximum number of columns you can have on a page that is landscape and has narrow margins?

The maximum number of columns you can have on a landscape page with narrow margins depends on the page size and the width of each column. Typically, for standard letter-sized paper (11 inches wide) with narrow margins, you could fit 3 to 5 columns. However, if the columns are narrower, you might be able to fit more. Ultimately, the exact number will depend on the desired column width and spacing.