When you initiate a transfer to your investment account, the money will first be deposited into your cash reserve. Your funds will remain here for one business day. On the following business day at approximately 11:00 a.m. EST, the funds in your cash reserve will be used to purchase the ETFs (exchange traded funds) that make up your portfolio.
Likewise, if you move money from your Investing Account back to your Spending Account, funds will be sold and the proceeds placed in your cash reserve. These funds will remain in the cash reserve for one business day then transfer to your Spending Account.