Paypal you have 90 days to get your money back, after 90 days you're screwed.
Hypothetically, if you buy today, they get shipped tomorrow, whats to stop them from mining it for 80 days?
Paypal has 90 Days, But...
But depending on your Credit Card issuer charge-backs can be up to 120-180 days.
File a charge-back with your credit card company not Paypal