The Fave e-Cashback will be valid for 30 days upon issuance (unless stated otherwise). If you purchase any voucher and proceed to cancel from your end, the Fave e-Cashback used to offset the purchase will be refunded back to the same form, with the original validity period.
To view the validity of Fave e-Cashback received, simply head to Fave app > ME Tab > My Cashback > click Fave e-Cashback to see details breakdown & expiry date.
Just as a gentle reminder, e-Cashback upon granted is not valid for extensions, refunds or exchanges in any forms, be it value of goods.