Our banking partner, Piermont Bank, invests a lot of resources into making sure your money is protected from fraudsters. One of those security protocols is limiting some of your transactions before they're made available to you (or someone attempting to access your funds). As such transfers to bring in funds from a linked external account may have a 2-3 business day hold period.
If you want to withdraw instantly from your Zeta Account, you can link your debit card and transfer funds to another financial institution. This service has a $1,000 daily limit and a 1.75% fee.