We always process refunds on the next working day. For most payment methods, the consumer's account will be credited that same day. However, this depends on the country that your consumer's account is located in.
Refunding a credit-card transaction does take longer. Because the transaction needs to be processed via all related credit-card systems. The refund will be credited to your consumer's credit card within 14 calendar days. Read more about refunding a credit card transaction here.
Be aware, the refund won't be credited to your consumer's bank account, their credit card will be credited. The refund is visible in the consumer's credit-card transaction statement.