Expect between 7 and 14 working days for a refund, which goes either to the original payment method or into store credit. Cancel before the order ships and you get everything back; once it has shipped, they wait until they confirm the returned item has arrived before processing anything.
If the item came in a bundle, the amount you get back is worked out proportionally. If the order couldn't be delivered, shipping costs may be taken off the amount.
Source: Swiss Arabian Saudi Arabia: refund policy