It's not usually apparent to the average consumer, but there are actually two stages to collecting payment, and two ways to undo it. The combination that occurs may lead to long refund times.
When you pay with a credit card, it is typically only authorised - the issuing bank says, "I'm setting this money aside for this transaction", but no money changes hands. You'll typically see this on your statement as a "pending" charge. Only later, in a process called "settlement", does your bank actually send money to the merchant's bank. Typically, this process starts the same day that the authorisation happens (at the close of business), but it may take a few days to complete. In the case of an eCommerce transaction, the merchant may not be allowed to start it until they ship whatever you ordered.
On the flip side, a given transaction can be voided off or money can be sent back to your card. In the first case, the transaction will just disappear altogether; in the second, it may disappear, or you may see both the payment and the refund on your statement. Voids can be processed as quickly as an authorisation, but once a transaction has started settlement it can no longer be voided off. Sending money back (a "refund") goes through the same settlement process as above and can take just as long.
We would love for our clients to receive their money back the second we process it (e.g. Skrill etc.) but when it comes to international transfers or card refunds, things do take time. We appreciate your patience and please know that I mentioned earlier, Fusion always does its best to process all our clients withdrawals as quickly as we can and before our 11am cut-off so that you can receive your money back faster. I'd also like to highlight that methods like Skrill, Neteller etc. are credited instantly back to your e-wallet if you find credit card too slow.