[tlhIngan Hol] A long document

Would a long body of text (be it a book, a letter, Grandma’s famous cookie recipe, etc.) be {nI'}, because it takes a long time to read it out loud, or {tIq}, because it occupies a long length of whatever medium it’s imprinted on? My instinct is {nI'}, but I’ve learned not to trust my instinct.