Funds sent from a Wallet balance, debit card, or linked bank account are generally available to the recipient immediately, and if the recipient has his or her own Wallet account and card, he or she can make an immediate withdrawal of those funds from an ATM.
While Google does not have revenue coming in from the Wallet ecosystem (the web service, app, and the Wallet Card), the product is part of a larger suite of e-commerce products, including Android Pay, which integrates loyalty programs and promotions from other businesses.