When you move fiat in or out of coinbase, it takes a couple business days to clear because it's a ACH process. These are never instant, which is not Coinbase's fault. When you withdrew money from your paypal account into your bank account it's also a few days because it's also ACH process. If you want instant, then link a credit card, although fees are pretty high with this method.
Obviously you're not comprehending the fact that Coinbase is preventing me from initiating
another purchase until Sepetember 15th and that after my first purchase completes, they won't impose this restriction on me.
This is the complaint in this thread.