The speed of a bank transfer usually ranges from one to five business days, depending on the bank and transfer type. Wells Fargo, for example, credits deposits from one Wells Fargo account to another in one business day, but deposits from other banks can take two business days.
Banks don't operate in real time. Money transferred from another bank does not actually leave the old account right away, nor does it instantly arrive at the new account. In these Automated Clearing House (ACH) transactions, it can take at least 24 hours to verify the funds. The transaction may not, therefore, show up in an account for several days.
Transfers from PayPal and other e-commerce institutions may take especially long to deposit into an account. PayPal transfers usually take between three to five business days.