When a payment is received, it appears as a pending balance in your Dashboard (minus any Stripe fees). This balance is available to pay out instantly for up to 24 hours or the creation time of your next scheduled payout, whichever comes first.
If an Instant Payout isn't manually initiated within that window, the funds are paid out according to your standard payout schedule. Once a standard deposit is initiated, those funds aren't available for Instant Payouts and the Instant Payouts balance is updated accordingly. Monitor the status of your payouts on the Payouts tab of the Dashboard.