Each one takes 10-15 minutes to make. Once I made one for myself, the whole family wanted them. (And then my sister's whole family wanted them. These are her cute kids.)
You can go to the Fairfield Website here to see how to make your own Easy Seat belt Sleeves.
And you can go here for my tutorial for making the nifty Back Seat Saver Upholstery Cover the kiddos car seats are on.