When you open an account, your teen will have three balances: a Spending Balance which will be connected to their card, a Savings Balance where they can store funds for later or a specific goal, and a Giving Balance if they'd like to give charitable donations. You'll also get a Primary Balance where you can store funds for later use.
While standard ACH timing applies to any deposit coming from your bank account, you can transfer settled funds you have on Current between these balances instantly. As a parent, this means your balance can be kept available for times when a deposit from your bank wouldn't be possible. If you're a teen, this means you can move your own money around whenever you'd like, giving you more control over your own funds.
You can read more about funding your account here as well.