game paks took longer to manufacture than cds, with each production run (from order to delivery) taking two weeks or more. by contrast, extra copies of a cd based game could be ordered with a lead time of a few days. this meant that publishers of n64 titles had less flexibility to forecast demand for their titles. publishers had to attempt to predict demand for a game ahead of its release. they risked being left with a surplus of expensive game paks for a failed game or a weeks-long shortage of product if they underestimated a game's popularity.