12 months in the US. It depends on the country. In Europe a device has to last a reasonable time with a minimum of 2 years. But the warranty is with the seller, not the manufacturer. This is why I generally buy from Apple directly, so they can't weasel out of it this way.
Though after the first year the onus is on the consumer to prove a manufacturing defect. During that first year the manufacturer has to prove it wasn't broken by the customer. That makes the discussion a bit harder after the first year. Also, these protections only apply to consumers. Businesses have to fend for themselves and that includes -employed when buying as such (and thus avoiding VAT)
Though after the first year the onus is on the consumer to prove a manufacturing defect. During that first year the manufacturer has to prove it wasn't broken by the customer. That makes the discussion a bit harder after the first year. Also, these protections only apply to consumers. Businesses have to fend for themselves and that includes -employed when buying as such (and thus avoiding VAT)