If you redeem the reward using the link in the email you are sent informing you of the reward, or using any debit card in the app, it will arrive nearly immediately after you finish the process. The transfer should appear within 1-2 minutes to the debit card or pay card you entered the information for when you claimed your reward.
If you redeem the reward using a bank account (checking or savings) within the app, your reward should arrive within 2 business days.