There is no limit on how many times you can use the code, though the products you add to cart must have the "Fulfilled by Amazon" or "Dispatched by Amazon" label. This, of course, casts a broad net across millions of items and categories from tech to electronics to fashion.
This Black Friday, we saw loads of deals on Amazon devices. Many of those deals have now ended, but you can still find discounts and bundles on the Echo, Echo Input and a certified refurbished Fire TV Stick. See these deals here, and all Amazon Cyber Week deals here.
Amazon says orders should be delivered in up to two business days after all the items of your order have been dispatched. Read more on Amazon's Free Delivery Week here.