Return anything up to 30 days. Warranty is covered by the manufacture as long as you have a receipt of purchase. Which is emailed to you upon purchase.
Are refunds given in the form of cash or crypto? And if crypto, will the refund be the original crypto amount paid or will it be a new amount based on price fluctuation?
Initially they are given as a credit on the site for your next purchase. If you want, you can withdraw it in crypto. The amount of crypto will be at the current market value at the time of the refund.